The Trader is a monthly magazine full of UK wholesaler's details. I've been a subscriber to it for years and can thoroughly recommend it to anyone trying to source stock. The trick to using it is to find those wholesalers that advertise just the once as the problem with the regular advertisers is that everyone else seems to sell their goods too. This is especially noticeable if you sell on the likes of eBay, Tazbar etc. There's no messing about, you get the wholesaler's addresses, phone numbers, email addresses, websites and sometimes even their prices. The website is pretty good but I'd recommend subscribing to the magazine or at least picking up a copy from your nearest main newsagents every now and then.
http://www.thetrader.co.uk/