Oops, my bad!! (as the yoof say). Sorry for doubting your logic Rakshasa!
However, as A2QFI says, I think the A4 Hub would prove v expensive to move - there's a lot of people there.
Regarding the sale of the land, I think the magic date is 2022 and before that we'd have to offer it to the original landowner at a well-below market rate.