Buying and reselling wholesale on eBayWatch
I've looked into wholesaling and selling on Amazon, but I think the margins are somewhat similar for UK wholesalers (wholesaling from abroad wouldn't be recommended for the time being). You can be looking at high product cost and relatively thin margins.
Even if your storage costs are neglible, you will still need to look at marketing costs and then eBay commissions/fees. If you do manage to scale it up, you will be subject to VAT.