Where my piggies sleep at night gets very cold and I would like ideas on how to keep them warmer. I have heard that you can't use heat lamps as this can give them heatstroke! So any ideas would be much liked. 

Snugglesafe heat pads!
http://www.vetuk.co.uk/cat-accessor...lesafe-microwaveable-heat-pad-and-cover-p-250
I have one for all mine, at the moment Honey and Littley are having one every night as Littley is so, well, little!
Good price from that link and easy peasy to use.
is that a really good price? i notice it says from on the price is there more than you size do you know? thanks