Who would prevent them from selling anything they like? Who would enforce that law?
PROBABLY, somewhere, whomever sold you that adaptor PROBABLY said something about its power requirements. It may not have been easy to understand, but it was probably there.
But... that doesn't get us any nearer a solution for your problem. For taht... there's WalMart, where you can buy a four-port POWERED USB hub (buy one that comes with its own "wall-wart" power supply).
Oh - you're in the UK. Do you have Wal-Mart there? If not, wherever you buy electronics stuff (including amazon.co.uk), they'll have a powered USB hub.
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