Toys R Us have a couple of deals on at the moment, on top of various small reductions on the prices they're charging for various sets (e.g. the AT-AT is still £20) off. The two other deals are :
Spend £50 on Star Wars stuff and get a £10 voucher which you can spend in store from the end of November to just before Christmas
Spend £20 on Toy Story Lego and get a free 30071 set. They also have various small reductions on most Toy Story sets.
I snapped up the latter deal today