Peter Davison is perfect as "Campion" in these mysteries from 1989-1990.
If I were to compare this series to Inspector Alleyn, the difference is in the personality of the detectives. The Campion episodes are more lively, as Campion rubs elbows with both the low and the high classes with ease. He also is very whimsical.
I believe this is a take-off on Lord Peter Wimsey, more of one than the Inspector Alleyn mysteries. Campion has his manservant, Lugg, who is devoted to him and obviously from the streets. Brian Glover is great in the role.
Campion always looks very dapper and wears wonderful horn-rimmed glasses. The episodes are brighter in look than the Alleyn mysteries, and, like the Alleyn mysteries, they have high production values. Campion's background is a mystery. He's obviously well-educated. In the books he's supposedly related to royalty and cut off from his family, and he's not using his real name.
High quality mysteries, very well acted, with a lovely song which Peter Davison sings at the beginning which sets up the series perfectly: lyrical, tuneful, and bright.