as the thread says does anyone know where I can get my hands on 80mm o\d 1.6mm wall alloy tube iv looked on ebay but can anyone recommend any where else in the uk preferably in dorset or south coast????
Merely a thought here, but if you cannot obtain one by conventional means then try an unconventional one! For example - my exhaust system manufacturer makes the stainless pipe to any diameter from a flat sheet of steel.
How hard would it be to do the same thing but out of aluminium? Try calling some metal fabricating companies and see if you have better luck there.