https://www.gov.uk/government/publications/property-value-protection-scheme
The NWS Property Value Protection (PVP) scheme is a support scheme and is only available to those who are able to demonstrate a compelling need to sell their property, yet have been unable to do so, other than at a substantially reduced price, due to the search for a suitable site to host a GDF in their community.
It is based upon previous public sector property assistance schemes such as those operated by Crossrail, High Speed 2 and National Highways.
This is a discretionary scheme, not one required by law. It recognises the importance of helping those eligible applicants who are most severely affected by the announcement of locations being considered to host a GDF.
This PVP scheme will remain in place until the Secretary of State approves communities to proceed to the site characterisation phase of development; or until a Community Partnership is dissolved following a decision, by either NWS or the relevant principal local authority(/ies), to stop consideration of a GDF in that community.
This document addresses some of the questions you may have as you consider whether you could potentially benefit from the PVP scheme.
More details on the website, including an application form:
https://www.gov.uk/government/publications/property-value-protection-scheme