EDIT - CODE CAN ONLY BE USED ONCE PER ACCOUNT.
PLEASE DO NOT HIT THE EXPIRE BUTTON UNTILL IT HAS DEFINATELY STOPPED WORKING, NOT JUST WHEN 1 OR 2 SAY THAT THEY CAN'T GET IT TO WORK!!!
I came across this by accident as I was faffing around with which set to buy. Tesco Direct currently have a voucher offer for £10 off when you spend £40 or more on Lego, but it seems to be taking the £10 off as long as you have at least £10 worth of Lego in your basket. Enter the code TD-SHRP for this to be applied. The cheapest sets over £10 that they have are Lego Technic Go-Kart and a Lego Creator Tub both priced @ £12.97 each, so you can get one for £2.97 provided you have the option to collect instore. A £5 delivery charge will apply if there isn't a store that you can collect from nearby,but it may still be worth it. There are sets starting from £3.97 each so you could get a few as stocking fillers etc...TIP - If you type lego into the search box on the direct page then select 'view all lego' and sort from low price to high you will be able to work out the best deals for you. The 1st 6 pages are full of sets that you can get for £10 or less! I bought the Lego Indiana Jones and The Lost Tomb 7621, priced @ £17.96 - paid £7.96 and got 35 c/c points too don't forget Quidco for another 3% I hope this helps someone :) Be quick!