Hiya, Tish, we had a 20x8, replaced by a 30x10 on our plot....on site, we also have a 42x14 communal one, be careful, some councils are now saying planning permission needed, we had to apply for pp for all the tunnels on our site and were only given 5 years temporary then we have to apply again :-\
ours gets the morning sun one side then it goes overhead so gets some sun all day..we have paving flags over the trenches we dug to put the plastic in, I have pots and troughs on these so I don't lose any planting space ;D