Glynwebb currently have 25% off everything in-store!
Depending on where you live you might not know of this store but it is a Home Improvement store along similar lines to B&Q, Homebase or Wickes. They are generally quite competitive even without the 25% off - with 25% they will be packed with bargains!
They only have stores in England in the Midlands, East Anglia and the North.
A store locator is provided on their website.