Boris Johnson changes rules so that being a lying **** doesn't carry with it an expectation to resign. Other changes include independent adviser no longer having power to launch investigation without the PM's permission.

So if the PM does something wrong, he is no longer expected to be penalised, and the independent investigator can only investigate with his permission. If the PM decides to be above investigation or accountability, then it is so.

Cue calls on the Queen to use her constitutional powers whilst knowing that will never happen, thus excusing the Tories because it's all legal and constitutional.