any advise on best pollycarbonate green houses it will be secured to a concrete base at top of my garden there was one there years ago but long before in lived here . it will be over hung by trees . hazel i have cut this back ash and sycamore . woodland behind metal shed to front 4 ft wall to the back it will get covered in leaves . it does get very windy in south wales price range £300 to £450 .. all ideas wellcome thank you .