A new year brings new resolutions, new plans and, thankfully, a new series of Sorry! writers Ian Davidson and Peter Vincent's charming Radio 4 sitcom. Ronnie Corbett reprises his role as ageing pensioner Sandy Hopper who, despite his children's best attempts, refuses to move out of the family home until his similarly ancient dog Henry has kicked the bucket.

Expertly weaving its way through themes of middle-class pretension and thinly veiled snobbery, this subtle comedy is a masterclass in the family sitcom viewed from a different perspective. It is also apparent that the gravelly yet mild-mannered Sandy was written with none other than Corbett in mind, and the veteran comic clearly relishes the performance.

Ronnie Corbett is back! Not in the outsized armchair, telling shaggy dog stories about his producer, but in series two of the cockle-warming sitcom by Sorry! scribes Ian Davidson and Peter Vincent. The deep-voiced micro-comic plays Sandy Hopper, still hunkering down in the family home until his ancient dog Henry expires. Daughter Ellie wants to get her reluctant son Tyson into an academy school, but Sandy doesn't know who to side with. A blizzard of comic detail peppers the tale of middle-class pretension, and it's a charming vehicle for Corbett. Liza Tarbuck channels the spirit of Pat Coombs as Sandy's lodger Dolores.

While Stephen Fry discourses on persuasive language (in advertising and so on) on Radio 4 here's an agreeable alternative, a brand new series of the sitcom where Ronnie Corbett plays a widower with a dog, a rather tarty lodger (Liza Tarbuck), a comfortable lifestyle - and a daughterwho wishes he'd hurry up and sell his house. Written by Ian Davidson and Peter Vincent who perfectly understand the way Corbett gently inflects a line into a joke. Produced by Liz Anstee for CPL Independent Productions Ltd. Don't worry. It'll be on Radio 4 before long.

Ian Davidson and Peter Vincent's delightful When the Dog Dies cast Ronnie Corbett as Sandy Hopper, a widower whose daughter and son-in-law are impatient for him to move out of his house - a move he has agreed to make "when the dog dies". The need, therefore, is to keep Henry - 116 in dog years - alive. This is a gentle, credit-crunch comedy for our times and Corbett is beautifully cast as the beleaguered oldie whose ungrateful offspring watch his every move like vultures. When he gets a sat-nav his daughter is horrified. "You shouldn't be spending money on that, there's already inheritance tax without you spending!" He is banned from burying the dog in the garden because, as his monstrous son-in-law tells him, "People won't buy the house with dead dogs everywhere". And when he graciously suggests, "we should all be singing from the same hymn sheet," the son-in-law ominously riposts, "We will soon Sandy."

When the Dog Dies (Radio 4, Friday) is a situation comedy by Ian Davidson and Peter Vincent with Ronnie Corbett for whom, long ago, they wrote the TV sitcom Sorry! This is an old fashioned series, with characters like cartoons and situations like comic postcards. It is also funny because, as with the best cartoons and postcards, it is recognisably lifelike and (again with Liz Anstee directing) very neatly set out. It's good to have heard the ring of confident production so often this week.

When the Dog Dies showcased the comedic talents of another old favourite: Ronnie Corbett. Corbett played Sandy Hopper, 65, whose dog Henry barked when he heard "cat", even when used in a word like "catastrophic". "Wuff!" said Henry: which was strange, as Sandy was supposedly writing a blog. As opposed to reading it out.

But then this was an old-fashioned sitcom, written by Ian Davidson and Peter Vincent, who penned Sorry, about the clash between ageing people and the modern world. The ever-engaging Liza Tarbuck was Sandy's sassy lodger, egging him on to bond with his grandson, Tyson. I enjoyed When the Dog Dies more than I expected. Clearly, I'm getting on a bit.

Ronnie Corbett plays Sandy Hopper in this new comedy by Ian Davidson and Peter Vincent. He's 65, a widower, living on in the old family home with his ancient dog Henry. His son and daughter (both married disastrously, according to Sandy) can't wait for him to move so that they can sell the house and divide the spoils. He won't, though. Not until the dog dies, he says. Sally Grace plays (charmingly) his nosy but nice neighbour. Liza Tarbuck (wittily) plays Dolores, his sexy but practical lodger. Jonathan Aris does an impressively monstrous son-in-law.