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When I had my ebay business it worked from my normal paypal account which was linked to my private current account and also used with my private seller ebay account.
As long as you keep records and accounts of what is passing through it does the job.
but i thought you needed a business bank account if your buying/selling things
Paypal T&C require a business account for a business paypal account
if it "all goes wrong" they will mess you around for months or years before you see your money.
most banks will offer you 2 years free banking... then just move banks
HMRC only require that you can account for the money correctly... comapny law requires that some buisinesses ( like ltd company) must have their own account.
The barclays business account is basically free if you dont use cheques or cash deposits.