Thanks for the offer mate. I will give it a go in the oven first as I sit in Brisbane Australia, by the time you get my sample I will have probably found a solution, but thanks again for all your help!!

I talked to my building manager (big on 3d printing), his father produces PET water bottles and he said, don't even bother with PET. The conditions of the filament has to be right and more so constant during the print. Any temp changes or exposure to humidity, which we have here equivalent to Florida, and your prints will never be good. Still will try but that chat wasnt of great motivational help