Factual error: No gearbox problem would cause the noises in the episode, it was a clutch problem.
Factual error: Bert is using an oxygen-acetylene torch, not butane, and the stop valve is NOT the large T piece on the regulator. Butane cannot cause a heart attack.
Factual error: When Rosemary finds Mr Teed's dead body, the kettle is boiling. It's the type that will keep boiling until someone turns off the stove or takes it off the heat; neither of these things happen, and yet, before the scene is finished, the kettle stops making that boiling sound.
Answer: Regents park.