I don't get it
Sorry for being an ignorant Yank. But I don't understand where the uproar is. Here in the states if you visit someone in prison/jail/etc, you will be recorded, no ifs or buts about it. Client-Lawyer privilege is another matter and they have non-monitored rooms for that. BUT, the lawyer in question actually has to tell the cops he is there for a privileged meeting. This policy pre-dates the whole terrorist scare bit on the premise that prison inmates don't have any rights (at least while in prison)... I imagine somewhere there is a similar policy/legal precedent in the UK. I don't see how the visitor being an MP should somehow change the rules.