Amazon Selling from the UK: A Fulfilment Guide for E-commerce Businesses

If you are searching for Amazon prep services UK providers, looking for a 3PL for Amazon sellers UK, or trying to work out the best approach to Amazon seller fulfilment UK, this guide is a practical starting point.

It covers the two core Amazon fulfilment UK options available to UK sellers, what each involves in practice, and where a third party logistics partner fits into the picture.

The two options are Fulfilment by Amazon (FBA) and Fulfilled by Merchant (FBM). The right choice depends on your product type, order volumes, margins and how much control you want over the customer experience at the point of delivery.

FBA vs FBM UK: What Are the Options?

Every seller on Amazon in the UK faces the same fundamental question when it comes to FBA vs FBM UK: do you send your stock into Amazon's network and let them handle fulfilment, or do you manage it yourself through your own operation or a logistics partner?

Fulfilment by Amazon (FBA): You send stock to Amazon's warehouses. Amazon handles storage, picking, packing, shipping, customer service and returns. Your listings become Prime-eligible, which can significantly improve visibility and conversion in competitive categories.

Fulfilled by Merchant (FBM): You, or a logistics partner, handle all storage, picking, packing, shipping and returns independently. Your listings appear on Amazon but fulfilment is managed outside Amazon's warehouse network.

Around 82% of Amazon sellers use FBA either solely or as part of a hybrid model, and it is the default choice for many. But fulfilled by merchant UK sellers represent a meaningful proportion of the marketplace, and FBM suits certain products, business models and margin profiles very well.

Fulfilment by Amazon: How It Works

Under FBA, you prepare your stock and ship it into Amazon's fulfilment network. Amazon then picks, packs and dispatches each order to the customer, handles delivery-related customer service and manages returns on your behalf.

Advantages of FBA

• Prime eligibility: your listings carry the Prime badge, which increases visibility and conversion for many product types
• Amazon handles customer service and returns for FBA orders
• Scalable without adding operational complexity on your side
• Leverages Amazon's established logistics infrastructure

Considerations with FBA

• FBA fees have increased significantly, rising by 10 to 15% in 2025, particularly affecting storage costs and fulfilment fees for larger or slower-moving products
• You give up control over packaging, branding and the customer experience at the point of delivery
• Products must meet Amazon's specific preparation and labelling requirements before being sent into fulfilment centres
• Long-term storage fees apply if stock remains in Amazon's network beyond certain thresholds
• Commingled inventory can mean your products are mixed with those from other sellers of the same ASIN, which creates risk around product quality and authenticity

Amazon FBM UK: How It Works

Amazon FBM UK means you, or a logistics partner, handle all storage, dispatch and customer service independently of Amazon's warehouse network. Orders placed on Amazon are fulfilled directly to the customer from your own facility or from a 3PL warehouse.

Advantages of FBM

• Full control over packaging, branding and the delivery experience
• No FBA storage fees or long-term storage surcharges
• Better margin structure for large, heavy or slower-moving products where FBA fees would be disproportionately high
• No risk of inventory being commingled with other sellers' stock
• Stock can serve multiple sales channels simultaneously from one operation
• Greater flexibility on Amazon shipping UK and international routing via your own carrier relationships

Considerations with FBM

• Without FBA, listings do not automatically carry the Prime badge. Seller Fulfilled Prime, which allows FBM sellers to offer Prime delivery, is currently closed to new applicants in the UK
• You are responsible for all customer service and returns related to fulfilment
• Meeting Amazon's delivery performance requirements under FBM requires reliable, fast logistics that consistently meet the promised delivery window on your listings

When FBA Makes Sense

FBA tends to work well when your products are small, lightweight and turn over quickly, when Prime eligibility is critical to conversion in a competitive category, or when you want to remove day-to-day fulfilment from your operation entirely and focus on sourcing and marketing.

When FBM Makes More Sense

FBM is a better fit for sellers with large, heavy or bulky products where per-unit FBA fees are disproportionate to the sale price. It also suits sellers with slower-moving or seasonal lines where long-term storage fees in Amazon's network would accumulate, and sellers who want to maintain brand control across packaging and the customer experience.

It is also a strong option for businesses selling across multiple channels. If you are selling on Amazon, your own website and other marketplaces simultaneously, managing all fulfilment from a single 3PL operation is considerably more efficient than splitting stock between Amazon's network and your own warehouse.

The Hybrid Approach

Many sellers use FBA and FBM together, routing products to each fulfilment method based on size, velocity and margin. A common approach is to use FBA for fast-moving, lightweight core lines that benefit most from Prime visibility, while managing larger, slower or more margin-sensitive products through FBM. This adds some operational complexity but allows you to optimise cost and customer experience across your catalogue.

Using a 3PL to Outsource Amazon Fulfilment UK

For FBM sellers, the main operational challenge is meeting Amazon's delivery performance requirements consistently as order volumes grow. Amazon monitors seller performance closely and falling below its thresholds can affect listing visibility and account standing.

The most practical solution for many growing sellers is to outsource Amazon fulfilment UK to a 3PL provider. Rather than managing a warehouse, packing team and courier relationships yourself, a 3PL handles all of this on your behalf. When a customer places an Amazon FBM order, it is processed, picked, packed and dispatched by the 3PL team.

CSM's London-based fulfilment centre provides ecommerce fulfilment UK businesses can use for Amazon FBM orders, with pick and pack for Amazon UK sellers alongside storage, dispatch and returns handling. Stock is dispatched via UPS, DHL and DPD, giving each order access to a multi-carrier Amazon seller courier UK network with the right service level for each destination.

This model works as an Amazon FBM 3PL UK operation, covering the full fulfilment workflow from stock receipt to delivery confirmation, integrated with your Amazon account through supported order management platforms. It sits alongside your other sales channels, so orders from your own website, Shopify store or other marketplaces all flow through the same fulfilment operation.

For a full overview of how CSM's 3PL fulfilment service works, see our guide to 3PL fulfilment UK.

Amazon FBM and International Orders

For UK Amazon sellers shipping to international customers, using a 3PL also supports cross-border delivery with more control than Amazon's international programmes typically offer.

CSM's European parcel delivery covers most EU destinations, with DDP options available so EU customers receive their orders without unexpected duty charges at delivery. This matters for Amazon FBM courier performance: a poor customs experience leading to a refused parcel or negative feedback will affect your seller metrics in exactly the same way as a late delivery.

Amazon shipping UK to EU customers under FBM requires accurate customs documentation on every shipment. For detail on how this works, see our guide to DDP shipping UK to Europe. For sellers also thinking about EU-side stock and fulfilment options, see our guide to EU fulfilment solutions for UK businesses. For worldwide destinations beyond Europe, CSM's worldwide parcel delivery service covers most international routes. For guidance on which carriers suit different Amazon FBM international routes, see our guide to best parcel carriers for growing ecommerce brands.

What Are Amazon Prep Services UK?

Amazon prep services UK is a term covering services that prepare stock specifically for inbound shipment into Amazon's FBA fulfilment network. This typically includes FNSKU labelling, poly-bagging to Amazon's specifications, bundling, carton preparation and shipment plan creation.

These services are distinct from FBM fulfilment. Amazon FBA prep services UK providers are set up specifically to handle Amazon's inbound warehouse requirements, which are detailed and specific to Amazon's systems.

CSM's fulfilment service is focused on direct-to-customer dispatch rather than FBA inbound prep. If you need FBA prep specifically, that is a specialist area requiring a provider set up for Amazon's inbound requirements. Where CSM adds genuine value for Amazon sellers is on the FBM side: storing your stock, picking and packing each order, dispatching via a reliable multi-carrier network and managing returns, all with personal account management and no minimum volume commitment.

If you run a hybrid model, CSM can handle the FBM side of your Amazon operation while your FBA stock is managed through Amazon's network independently.

Getting Started with CSM for Amazon FBM

Opening a CSM account is free with no minimum volume commitment. Once set up, your Amazon FBM orders are integrated alongside your other sales channels through CSM's supported ecommerce integrations. Stock is transferred to the CSM London warehouse and your team is free to focus on selling.

Every CSM account is managed by a named team with no call centres. When you need to adjust service levels for specific destinations, discuss your Amazon order profile or get advice on international shipping, you speak directly to the person who manages your account.

Find out more about CSM's e-commerce shipping solutions, contact your local CSM branch to discuss your requirements, or open an account to get started today.

Frequently Asked Questions

What is the Difference Between Amazon FBA and FBM for UK Sellers?

FBA means Amazon stores, picks, packs and ships your orders from its own fulfilment network, and your listings become Prime-eligible. FBM means you or a logistics partner handle storage, dispatch and returns independently. FBM gives more control over branding and costs but requires reliable logistics to meet Amazon's delivery performance standards.

Is FBM Worth It for UK Amazon Sellers?

FBM is worth considering for sellers with large, heavy or slower-moving products where FBA fees would be disproportionate. It also suits sellers who want brand control, want to avoid commingled inventory risk, or serve multiple sales channels from one fulfilment operation. Many sellers use a hybrid approach, FBA for fast-moving lines and FBM for others.

Can I Use a 3PL for Amazon FBM UK?

Yes. An Amazon FBM 3PL UK provider handles your storage, pick, pack and dispatch on your behalf. Your Amazon FBM orders are fulfilled to the customer directly from the 3PL warehouse. CSM provides this service from its London fulfilment centre with no minimum volume commitment and full multi-carrier dispatch via UPS, DHL and DPD.

Does CSM Offer Amazon FBA Prep Services in the UK?

CSM's fulfilment service is focused on direct-to-customer dispatch rather than Amazon FBA prep services UK such as FNSKU labelling and poly-bagging for Amazon's inbound warehouse requirements. CSM supports Amazon sellers on the FBM side of their operation, handling storage, pick and pack for Amazon UK FBM orders, dispatch and returns.

Can CSM Handle International Amazon FBM Orders?

Yes. CSM dispatches to most worldwide destinations via UPS, DHL and DPD. EU orders can be sent on DDP terms so your Amazon customers in EU markets receive their orders without unexpected duty charges. Your CSM account manager can advise on the right carrier and service level for your specific international order mix.

How Does CSM Integrate with Amazon for FBM Orders?

CSM integrates with order management platforms including ShipTheory and Linnworks, which both support Amazon order syncing. This allows your Amazon FBM orders to flow automatically into the CSM fulfilment operation. Visit our ecommerce integrations page for full details.