First of a series of murder mystery comedy specials written by Jason Cook and starring Johnny Vegas and Sian Gibson, which each had a title spoofing an Agatha Christie mystery. The others are Death on the Tyne (2018) and Dial M for Middlesbrough (2019).
Johnny Vegas and Sheila Reid were both regulars in the TV comedy series, Benidorm (2007). As well as this, Nigel Havers, Una Stubbs, and Mark Heap have all had small roles in the show.
When Doc, plays by Nigel Havers said he wasn't a real doctor after the death of Kevin, he states he was a con man. This could be a link to his character in Coronation Street where between 2009 and 2013 he played con man Lewis Archer.