Ah I C. I know that tin foil isnt great for this but I dont know about space blankets lol.
From what I have heard the best stuff to use is a material called Mylar. It's quite cheap and is easy to use. You can get it your local hydro shop if you have one close to you or you could try
www.growell.co.uk who will post it to you
.
Hay Katt the UK thread is so addictive isnt it? lol you should pop in and leave a message DJ.
Peace Out
BU5T4