SP - there is an unallocated pot of money amounting to several £ billion, one of the legacies of Philip Hammond's time at the helm. Although there's also a queue of unfunded wishlist items. It's possible, given hints that have been dropped, that MPA has worked its way towards the top of that list. But whether the rules allow it to be used to fund a lease deal, as opposed to outright purchase of a slack handful, I don't know.