Thanks for the responses all.
Ajapale I will look later if there was anything in your google, I could not find anything when Il looked myself last week for a link direct to the manufacturers.
Paddy my local garden centre sells the Poly tunnel polythene so dont think he would be willing to divulge where he got his, but you have given me the idea of trying the local horticultural training centre where they have a number of poly tunnels.
Berberis I will try those places in the morning thanks, will post how I get on.
Ronan I would say they may indeed do for a green house but would imagine that they would only last a season as they are not UV resistant, the kind I am looking for is 800 gauge that is supposedly five layered and anti fog or anti drip.
Thanks again everyone, any more ideas gratefully received.
I am also looking for galvanised poles, the ones they had in Heiton Buckleys seem to thick a steel, I am looking for around an inch and a half diamater that I can take to a guy I have found who can bend them to shape. I want to buy good quality but not so heavy a steel that they can not be shaped and are to heavy to handle but on the other hand not so thin they are not fit for purpose.