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A huge amount of this is because of the fact that the BBC nigh on forced many of its presenters into contracting schemes.
HMRC have since gone after them [the presenters] because of this, and many are calling for HMRC to go after the BBC as it was them that forced the issue.
Lineker's case is still ongoing after 7 years or so. Just google "BBC IR35" for lots of links.
Lineker specific link: https://inews.co.uk/inews-lifestyle/money/gary-lineker-tax-clash-bbc-paying-legal-fees-2201702
Aren't most of the presenters on MOTD contractors?
Then the consideration becomes, do "staff guidelines" apply to contractors given the vagaries of issues such as IR35 if the BBC try to apply such rules?