A judge had not erred in finding that an airfield owner had a reasonable prospect of obtaining planning permission to demolish buildings on the site to enable residential development, notwithstanding that the local authority's development plan contained a principle to retain and support aviation-related facilities at the airfield. The plan expected developers to contribute to achieving the principle where it was "appropriate and reasonable", conferring a discretion that allowed the local authority to take into account that the owner, for legitimate economic reasons, did not intend to re-instate the buildings' aviation-related uses even if demolition consent was refused.