Thanks folks we went to Ashbourne sat and we used a carpet from a birdland 5 in our birdland 3 ... Bingo .. bloody boiling in fact( dare I say this?).. Too warm!!..thanks
I have just got The Kampa Low Volage electric blanket and have put it under my SIM, Its awesome nice and warm at night.
Not sure about doing the whole tent, but works for me under the bed!!