I DON'T know if you are aware, but many councils are now insisting on planning permission for polytunnels.

There is a petition against this at http://petitions.pm.gov.uk/noPP4polytunnels/ (No Planning Permission for Polytunnels) "Polytunnels are a fruit and veg producers best friend, allowing crops to be started with a greater degree of protection than if planted straight into soil. Councils should not insist on planning permission for these as they are as temporary as a greenhouse. Keep the UK growing it's own food!"

Georgina Bass