Do they do them often? We have something expensive we want to buy there but don't want to buy it and then see they have a 10% day the following week. Anyone heard of one coming up?
If you sign up for one of their loyalty cards they will send you info on when the next 10% day is - plus you get to build up points which they send out as vouchers, so you save a bit more.
I've been doing some work on the house over the last while (insulation, floor in living room and God knows how many other jobs) and saved quite a bit with it.