I'm sure that all the accounts will be in order and that all the BASSA officers will be correctly remunerated. I'm also sure that such people, being in the public eye, will be sure to have made the appropriate returns to HMRC.
As an aside, if anyone feels that they know someone is evading tax and they want HMRC to know about it, there is a handy link here:
HM Revenue & Customs: Reporting Tax Evasion