Instructions:The link takes you to home page, which says 10+20% off, excluding clearance.
The code I've entered gives you extra 10% off clearance items. Example -- Steam generator iron - model GC6625/30 - list price £135 - less 30% £94.50. - less 10% with code £84.50 with free shipping.
It worked for me, so should be OK across the board. Unfortunately I do not know when the 10% offer ends.