So as part of the normal annual audit process the sale will be examined by the auditors. No real surprise there it would form part of their audit risk assessment and be well above any level of materiality for audit testing. To understand it they would need and have right to all associated documents.
It should not come as any surprise to anyone that the deal was fully examined by all sorts of different parties including specialists in the various aspects, lawyers etc. It wasn't a council leader saying one day to herself lets sell up to Wasps and doing it. It is also to be noted apparently no dissenting voices from left or right on the deal (with leaders of both sides properly involved)