Stamp Auctions Save
Includes current catalogue. [May not work in all browsers]
http://www.stampauctionsales.co.uk/   

Stanley Gibbons Stamp Auction Save
Includes lots for Antarctica, Commonwealth, Europe, Great Britain and Philatelic products.
http://www.stampsatauction.com   

eBay UK Stamps Save
Large UK online stamp auctioneer.
http://stamps.ebay.co.uk/   

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