This weekend at dorothy perkins there is 20% off most items (not sale items). The discount is automaticly applied at your basket. There is also a voucher code from closer magazine for a further 25% off! code is DPCLOSER25. The 25% off code works on everything including things already 20% off :) so lots of bargains to be had!
I've just bought a dress which was £39.50 and with both codes applied I only paid £23.70! total discount was £15.80 :D
Just noticed they're giving away a free Rimmel nail varnish and a copy of closer magazine with every purchase while stocks last!
EDIT Theres also a 10% off code too which you can use as well! dpc10 :)