Each year superdrug hold a 90% off sale normally from Christmas Eve until stock runs out-this is usually online from Xmas eve and then in store from Boxing Day.
Having seen other members post some of the deals on superdrug today I have searched on superdrug and found that some (not all) things are reduced by 90% and many being reduced by 50%+. To see these reductions search christmas, all christmas and then sort price low to high. Plus there is free next day click and collect