Rosemary & Thyme (2003)

A plant pathologist and a former police constable go into business as gardeners, and somehow every stately lawn or hotel border they take on comes with a corpse. Felicity Kendal and Pam Ferris make a lovely double act, trading dry remarks over pruning shears, and the gardens themselves, in England and abroad, are half the pleasure. This is about as gentle as murder gets on television, which makes it perfect for a lazy afternoon.