Starting today and lasting until Sunday, Toys R Us in the UK has a 20% off deal for many brands, including Lego. You can use it online (with the code TOPBRANDS20) or if you want to get the discount instore, you’ll need to print off this voucher and present it with your purchase.
They don’t appear to have the new Star Wars sets yet on their website, but they do have the Lord Of The Rings sets, if you’re into that. Not sure about local store set availability though as I’ve not been to a store in a while.
Happy Discount Hunting!