Just in case anyone isn't aware, the actual Lego site itself is often the cheapest for lego.
Just bought the VW Beetle set. It's £117 on Amazon plus postage with private sellers going even higher than that.
Its £69.99 on the lego site, free delivery, free London Bus set and they've also chucked in a bagged set that makes a Parrot. Ordered two days ago and it's just been delivered.
I've found the same with different sets in previous years. Amazon and Ebay and other places selling for a lot more than you can buy it direct...and I got £1.75 cashback tracked on Quidco.
There are obviously sometimes bargains to be had, but make sure you check the proper price on the lego site too.