that one will do Ree!
I think there are a few online wotsits very similar to that . I haven't seen that one before , but it looks like it covers how to make a PT very well. Good find. It was on Geoff Hamiltons gardening program years ago that I first saw him make a cloche out of polythene and blue pipe. very cheap ! At the time I thought use bigger pipe and you've got a polytunnel . Now everyone and his uncle are making them ....great stuff. If you have to buy the pipe it works out a bit pricey though , about 100 quid for the cover and the same for the pipe , but that would give you a 20'x10' or a tad bigger !!! Not seen a pt that size, for that price anywhere !!!
Russ