Focus are running a promotion at the moment where if you spend £50 in store, you get 15% off your purchases, and they give you a card so you can get 10% off further purchases until the end of August.
I've just been in and spent £40, and the assistant offered me the discount and card anyway. She said they were now offering it to anybody who spent over £40. I'm not sure if they are doing this in every store, but it's worth asking if you need any diy, garden or pet stuff.