I think you might have skipped a few stages to suggest we've a Billionaire owner now in charge. Shall we wait to see how the bidding goes first, then see who the preferred bidder is? I'm sure it will be a Billionaire, but we've not yet crossed that line.
As for Q4., there is no FFP as such in L1. It's SCMP (Salary Cost Management Protocol) which restricts player related expenditure to 60% of the previous seasons turnover. Our turnover last season was, I believe, around the £26M mark. If the same this season, and it's likely to be less, then that would equate to around £15.6M on players wages, bonuses and transfers. We might end up with a transfer kitty of around £2 - 3M.
On top of this, an owner can inject cash. There is no strict limit on the amount of cash that can be injected, but under the new SCMP rules for next season, only 60% of any cash injected can be used for wages and transfers. So the new owner might put in £10M, giving us an extra £6M on wages and transfers. Or a £100M (I'm sure this amount wouldn't actually be allowed) giving us an extra £60M.
Infrastructure, as in all levels of the game, is exempt from any SCMP/FFS/PSR rules.