I also recommend
http://www.lights4fun.co.uk/
They have good quality LED rope lights that runs cooler, cheaper, and lasts longer than the usual rope lights that people like TLC sell.
I have bought lots of stuff off them, and recommend them. (but then they did put a picture of some of our christmas lights up on their website
http://www.lights4fun.co.uk/28/popupgallery2.asp 
)
However, the advantage of the TLC ones is they can be cut to exact size. I don't know about the LED ones.
But then compare the electricity usage.
LED: 30 bulbs per metre = 2w
Duralite: 36 bulbs per metre = 16w