I have signed up for Amazon Local, Groupon and Wowcher as they always have great offers on.
Here are the websites...
Amazon Local http://local.amazon.co.uk
Pumpkin Patch - Summer Clearance and free delivery http://www.pumpkinpatch.co.uk
Picanova- up to 65% off
Dorothy Perkins - up to 70% off
Miss Selfridge - up to 30% off
Asos - up to 70% off
BHS - up to Half Price Sale