What is this land worth?

What is this land worth?
Mayfield Market Towns have stated that they control 464 acres of land in Horsham District, and 135 acres in Mid-Sussex District, some within the site proposed for their new town and some outside, but they have not yet provided evidence to support this claim. LAMBS, by contrast, currently has over 4,300 acres signed up as ‘not available’. They have released an interesting two-page document [PDF] that deals with valuation and compulsory purchase issues.