....anyway...

To an objective observer who has dug a little into the background...

It really could look as if Cliff has a long running petty vindictive grudge against the BBC...???
and is now acting like a spoiled diva with a massive sense of entitlement;
spitefully biting the hand that fed him,
that helped make him into a superstar...???

Reminiscent of a lengthy marriage which has turned sour and ended up in a bitter costly legal battle...
where neither partner comes out of it smelling of roses...