VoucherCodes.org - Daily updated list of discount voucher codes ordered alphabetically by merchant. - http://www.vouchercodes.org/
Tesco Voucher Codes - List of user submitted money off and clubcard points offers redeemable against Tesco orders online. - http://tescovouchercodes.blogspot.com/
HotUKDeals - Constantly updated list of member submitted deals, voucher codes and bargains that can be ranked/discussed by members. Includes static list of voucher codes ordered alphabetically by merchant name. - http://www.hotukdeals.com