My wife got me watching this as she is into Detective/Crime Drama and I must say I was very pleasantly surprised for several reasons. The use of actors who probably had their heyday twenty years ago was one and the stories are very well written. The show is classed as Drama but there is fun and games in there too.
James Bolam is an actor I have long rated highly and this shows he has not lost his touch. In fact the range of acting skills these people bring to the show make younger actors in the same show look shallow. The team knit well together. They make great use of the fact that they are all retired police officers who can and do ignore rules and protocols to solve supposedly dead cases.
It makes a refreshing change compared to some American shows of the same genre. I strongly recommend it.