Next cheapest in stock is £16.97 at Amazon.
A rather random find, and the other series are all £22.99.
Series 3 of the classic 1970s sitcom about an eccentric middle-class couple who decide to leave behind the empty promises of the rat race and live off their land--without leaving the suburbs. Tom and Barbara Good (Richard "Sugar Flavoured Snob" Briers and Felicity "Treacle" Kendal), much to the horror of their conservative neighbours, the Leadbetters (Paul Eddington and Penelope Keith), decide to turn their suburban home into a self-sufficient utopian garden, with "hilarious" results.
Don't forget 10% Quidco.