I can’t stand Michael Parkinson! Went right off him years ago when he was interviewing a very young Charlotte Church and asking her (to me) inappropriate questions. It gave me the unsavoury creeps which have never gone away.
And later, when he’s been advertising in that oh-so-cosy voice, funeral or other savings plans aimed at people with not much or very little money. And presumably being paid handsomely for it.
Re the original question, radio and TV presenters who I’m sure wouldn’t usually or habitually do it, endlessly dropping their Ts.
I swear they are instructed by the Beeb to do it, in order to sound un-posh, ‘relevant’ or ‘edgy’ or whatever they like to call it - certainly not ‘common’, perish the thought!