The thoughts of the indomitable Ladies turn to all things Green in this latest collection of Letters.When Irene hears that her Aunty Doris has died and she must sort out her personal effects, she is filled with a sense of personal and global doom. Finding out that Doris was a fervent campaigner, and aware that Vera is a keen recycler, Irene decides to send Doris' clothes to Vera - with explosive results...

Meanwhile, Vera has thrown herself into environmental causes, winning the courgette competition at Great Shags' Greener Gardens show. Soon both Ladies are eco-enthusiasts, tying bricks to ballcocks, running cars on chip fat, and even emailing Al Gore to update him on the state of the local bottle bank.

Inevitably, disasters occur, with toilets blocking, cars self-combusting, and even rivers getting diverted. Irene is worried about the peoples of the planet, but people closer to home are causing problems too: her son Christopher, who has been travelling the world carbon trading, has fallen in love. But who is the mystery paramour? With familial chaos on the horizon, the Ladies find that saving the planet is the least of their worries...

Patricia Routledge and Prunella Scales return as the outspoken pen friends