Thanks. Great reply.
The website that I mentioned, point north, sells thinsulate at £5.90 per metre. I could incorperate that in some way. I'm not sure what thinsulate is. I used to think it was some sort of fleece or wool because I saw it writen on gloves and watch caps, but it seems to be some sort of wadding material. Can anyone enlighten me? ( I don't want the thread hijacked <img src="images/graemlins/wink.gif" alt="" />)