04:30The Cheese Shop PresentsSeries 1Episode 4: The Butter FactorBBC Radio 4 Extra Duration: 30 minutes Tue 16th Oct 2007, 04:30 on BBC Radio 7Hercule Poirot's murder mystery - and a freak piano student. Sketch comedy from Edinburgh with Dave Lamb. From January 1997.GenresComedyBrandThe Cheese Shop PresentsSeriesThe Cheese Shop Presents: Series 1 Source: BBC Online