Switching prep centres mid-flow is painful, so the choice is worth getting right first time. These are the questions that actually change the outcome.
1. Where are they, relative to where you ship?
Amazon's UK fulfilment centres cluster around the Midlands and the North West. A prep centre in Birmingham, Atherstone or Wolverhampton typically reaches them on shorter, cheaper routes than one at either geographic extreme.
If you import, weigh this differently. A centre near Felixstowe, London Gateway or Liverpool docks that can receive containers directly removes an entire haulage leg - and that saving usually dwarfs the difference in outbound pallet cost.
2. What is the realistic turnaround?
Most UK centres quote 24 to 72 hours from receipt to dispatch. Ask what that means at their busiest - Q4 turnaround is the number that matters, not the quiet-Tuesday number.
Stock sitting in a prep queue is working capital doing nothing. For fast-moving arbitrage stock, paying a little more per unit for a genuine 24-hour turnaround often pays for itself.
3. Is pricing published or quote-only?
Neither is a red flag by itself, but published tiered pricing makes comparison honest and signals a centre confident in its rates. Quote-only pricing is normal for centres doing bespoke 3PL work.
Whichever it is, get the complete rate card in writing before you commit - prep, bagging, bundling, storage, forwarding, returns and removals.
4. Do they handle your category?
Dangerous goods, food and supplements, fragile items and oversized products all carry extra handling requirements, and not every centre accepts them. Precision Prep explicitly handles DG products; FastPack FBA handles hazardous goods; many centres do not.
Confirm before you ship, not after. A rejected delivery at the prep centre is a much better outcome than stock stranded somewhere with no plan.
5. How will you see what is happening?
Ask what visibility you get. Some centres run their own warehouse management portal with live stock levels - Ascend FBA's ControlDock and Blue30's WMS portal are examples. Others work from spreadsheets and email.
Ask how they communicate problems, too. Damaged or short deliveries are inevitable eventually; what matters is whether you find out immediately, with photos, or three weeks later.
6. What happens when something goes wrong?
Ask directly: is the stock insured while in their care, to what value, and what is the claims process? Ask what happens if they mislabel a batch and Amazon rejects it. A centre that has a clear answer has thought about it before.
Ask about security too - CCTV, alarm grading and access control are worth confirming if you are storing meaningful value.
7. Can they grow with you?
A centre that suits 300 units a month may not suit 10,000. Check their volume tiers extend past where you expect to be in a year, and that they can take container deliveries if importing is on the roadmap.
Equally, do not over-buy. A large 3PL geared to established brands may be an awkward fit - and an expensive one - for an arbitrage seller doing a few hundred units.
8. Who else uses them?
Ask for references, and check independent reviews. Several UK centres carry public Trustpilot records - Prep365 at 4.8 from 63 reviews and Fast Prep at 4.7 from 26 are among the stronger ones - which at least tells you other sellers have used them at volume.
Seller communities are useful here in a way review sites are not: people are candid about who lost their stock.
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