Can't be fannying round with links though (= never manage to do them properly)
Cox and Cox
Lakeland
John Lewis
Heals
QVC (only on a Sunday, t'is when the Beauty special offers are on and sometimes you can pay easy payments over 3 or 4 mths interest free- got loads of Elemis stuff last year)
Photobox/Vistaprint for personalised photo cards/mugs/canvas prints/calendars
Amazon (no shit Sherlock)
M and S (also now deliver here) but am waiting for a potential 20% off everything day to come up.
Thorntons
L'occitane (hang fire, I always get a discount voucher in November, usually for 20% off)
The book people (the most phenomenal savings)
White Company (not Stuff, that's horrid trendy clothes, Company for gorgeous gorgeous classy decs and wrappings and other poncey stuff)
Gisela Graham
Curious Minds (fab sciency toys- I browse what they've got, then order it from somewhere else who is doing a 3 x2)
Tesco/Sainsbury's- keep checking promo codes thread for specials.
Neal's Yard
Tisserand
Christmas Time UK (again, for ideas, then I buy it elsewhere)
The Toyshop/Entertainer - fab toyshop online often with hooooooge discounts, you can also pay with Paypal.
Very/Littlewoods etc- will soon be doing their 50% off a £60 spend for new customers. Every year I open a new account to take advantage. 
Erm, I'll add more as I remember them!