CPRE Hertfordshire is campaigning for an urgent change in the revised National Planning Policy Framework (NPPF) published in December 2024.

They are calling on the Government to amend the definition of so-called 'grey belt' land in the Green Belt.

CPRE have argued that since the publication of the revised NPPF in December "every major planning application for Green Belt land in Hertfordshire has asserted that the proposed development site is 'grey belt' and that this should justify granting permission. We think it's both tragic and unnecessary that these and other highly valued landscapes are at imminent risk of being lost to development, forever".

CPRE have provided those wishing to join the campaign with a template letter to use to contact their MP