A bit of a change of tone in this week’s improvised celebrity murder mystery. After Jamie Laing and Greg James being very much subordinate to DI Sleet (Tom Davis), Dragon's Den alpha female Deborah Meaden – not surprisingly – doesn’t take much in the way of shit from her superior officer.

Their relationship does not get off to the greatest of starts when he calls her “pig” - even if it is meant as a term of affection. But they soon have to concentrate on a showbiz killing rather than killing each other when a minor matter of cock-shaped hedges promptly escalates and Lady Gaga drops down dead head-first into her soup. 

But whodunnit? Lady Cheryl Fernandez Versini? Retired Scout Master Boris Johnson? Invalid Aunt Nicki Minaj? Or shifty butler Jay Z? As you would expect, Meaden is a pretty fast learner and soon asserts herself. Though this is not necessarily the same as getting things right…

Improvisation seems to be on a roll at the moment, with Whose Line Is It Anyway? making it’s overdue West End debut next month and there is lots of fun ad libbing here too – particularly when Sleet and Meaden have to share a bed and there is a sublimely puerile dispute over who broke wind.

Meaden is a good sport, despite clearly not suffering fools gladly. She is pretty much up for anything apart from a patronising nickname, making this a great instalment in this idiosyncratic series. Good supporting cast too, with Rachel Parris, Cariad Lloyd, Marek Larwood, Jenny Bede and Jason Lewis chipping as Gaga and the suspects.

Agatha Christie this ain't though. Just remember that "the one who smelt it dealt it" is not always the best method of cracking a crime.

Murder In Successville, BBC3, 10pm, Wednesdays. Watch it here.