UNSALMarketplaces are the starting point for a large share of UK online shopping journeys. Each platform has its own audience, fee structure and rules — and the operational demands of running them well are often underestimated.
The main platforms
- Amazon — the largest by some distance. Winning the Buy Box depends on price, stock availability and fulfilment performance; Fulfilment by Amazon (FBA) or Seller Fulfilled Prime make a significant difference.
- eBay — strong for collectibles, refurbished and value ranges, and still an important channel for many small businesses.
- TikTok Shop — content-driven discovery, where sales come through creators and live shopping rather than search. It can scale fast, but needs a steady flow of video and affiliate partnerships.
- Temu and Shein — low-price, cross-border platforms that have reset price expectations in several categories.
- Etsy, OnBuy, Fruugo — niche or growing alternatives worth testing for specific ranges.
Retailers becoming marketplaces
A growing number of UK retailers — Debenhams, B&Q, Next and others — now let third-party brands sell through their websites. For a brand, this can mean the reach of a household retail name without a traditional wholesale listing, though commissions and service standards are demanding.
The operational side
Marketplace success is mostly operational: accurate stock across channels, fast dispatch, low cancellation and late-shipment rates, and well-structured listings. Inventory synchronisation becomes critical once you sell on more than two platforms. Fees also add up quickly — referral fees, fulfilment fees, storage fees, advertising — so margin should be calculated per SKU, per platform.
Compliance is tightening
Marketplaces are already responsible for collecting VAT on many sales by overseas sellers, and are asking more of sellers on product safety. The Product Regulation and Metrology Act 2025 allows the government to place new product safety obligations on online marketplaces, and for toys and other regulated categories platforms increasingly request test reports and a UK responsible person before listing.
Key takeaways
- Choose platforms by audience and category fit, not by size alone.
- Measure profitability per SKU after all platform fees and advertising.
- Keep safety and VAT documentation ready — platforms will ask for it.
This article is general information, not legal, tax or financial advice.
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