" the site gets sun from 3pm but would be shaded by the house before that

Does anyone have any thought on the tint of those temp. greenhouses
I can choose between a clear one or one with quite a heavy green tint
(its the argos ones and similar)

If it in the shade you want the cover as clear as possible, and anyway,
with
our low light it's better to get clear and use shade cloth or similar if
it's ever needed.

thanks for that Bob

will report back on my heavy crops (fingers and toes crossed)

rgds

niall