I'm hoping my post will jog some memories, so I'm going to witter on about the author.
I did find some information but am not repeating it here as I think it is actually the blurb from a subsequent book THE MOLEHILL FILE.
The following comes from Wikipedia:
Michael Kenyon (1931 – 2005 ) was an author of crime novels. Author of more than 20 humorous mystery novels, he was one of the first in the field of spoof-espionage story telling, but perhaps better known for the Superintendent O'Malley, and latterly Inspector Henry Peckover series of books.
Peckover was especially successful, fondly known as "The Bard Of The Yard". He was also a regular contributor to Gourmet Magazine, The Washington Post and the Los Angeles Times.
- May You Die in Ireland (1965)
- The Whole Hog (1967)
- Out of Season (1968)
- Green Grass (1969)
- Mr. Big (1975)
- Brainbox and Bull (1976)
- The Rapist (1977)
- Deep Pocket (1978)
- The Molehill File (1978)
Superintendent O'Malley Series
- Hundred Thousand Welcomes (1970)
- Shooting of Dan McGrew (1972)
- A Sorry State (1974)
Inspector Peckover Series
- Zigzag (1980)
- The Man at the Wheel (1982)
- A Free-Range Wife (1983)
- A Healthy Way to Die (1986)
- Peckover Holds the Baby (1988)
- Kill the Butler! (1991)
- Peckover Joins the Choir (1992)
- Peckover and the Bog Man (1994)