The thing that gets me about these APT rules (along with the definition and the club's requirement to prove FMV, which are both on shaky ground, I would imagine) is that the PL don't just want to adjust the income if they think it is overstated (which is already fraught with difficulty), they want the club and the sponsor to alter the terms of the sponsorship contract or cancel it(!).
I can't imagine it's legal for a regulatory body to tell two independent companies which commercial contracts they can enter into, and on what terms. I find it hard to believe any tribunal will allow a third party to do that?
I may be wrong, of course, but surely not?