Trilley
Yet, as more than one person has pointed out, when you purport to correct the "errors" about who appoints the PPS and the party Whips, it was you who was in error, @Florianus. Any chance of you acknowledging that?
I was correct about the whips. The procedure is explained on many web pages, such as that of The Institute for Government:
The main political parties appoint MPs and Peers to ensure their colleagues tow the party line and abide by the instructions contained in the ‘whip’. Drawing on the name of the system, these MPs and Peers are called ‘whips’. The Labour and the Conservative parties both appoint around 14 whips, while the smaller parties have smaller whipping operations.
The whips, as I said are appointed by the political parties, not by the Prime Minister. He does, though, appoint a PPS - so I was wrong if I said otherwise.