Went up to the allotment yesterday, and got talking to one of the plot holders, who was in the process of constructing a greenhouse, he then informed me that he only paid £50 for an 8x6 from one of the other allotmenteers, all it needs is one or two pieces of glass............... :'(
What a good bargain, but keep your eyes and ears open you will come across one for yourself. ;) ;)