But, as widely discussed on the radio this morning, putting pressure on MPs is how Westminster works - it would be surprising if parliament has acted criminally for the last few centuries.
William Wragg is a well respected MP. The fact he's bought this up suggests this is an unusual, new behaviour by the whips, not that Paliament has been acting unlawfully for centuries.
Legal definition of blackmail:
(1)A person is guilty of blackmail if, with a view to gain for himself or another or with intent to cause loss to another, he makes any unwarranted demand with menaces; and for this purpose a demand with menaces is unwarranted unless the person making it does so in the belief—
(a)that he has reasonable grounds for making the demand; and
(b)that the use of the menaces is a proper means of reinforcing the demand.
I'm horrified that MPs have been allegedly threatened with smear campaigns against them if they break ranks with the party line. That's totally unacceptable.