One Foot in the Grave (1990) (S2, Ep 2)

Ep 2: We Have Put Her Living in the Tomb. Having moved into their new home, the Meldrews set about decorating it. But then Margaret makes the fatal error of agreeing to look after their god daughter Jennifer's pet tortoise, which goes very badly wrong... Starring Richard Wilson, Annette Crosbie, Sarah Mortimer, Doreen Mantle, Andrew Powell, Malcolm Frederick, Arnold Chazen, Lydia Henderson-Boyle and Pat Worth. A famous and notorious episode, this is another one where David Renwick's 'love' of animals sees another ill fated critter meet it's maker in gruesome fashion. But it's the twist ending that probably makes it not one for animal lovers to view. You have been warned...