Jim Parker is one of my favorite film composers. I first heard his music on the British series Foyle's War and subsequently on the delightful Midsomer Murders series. His music is melodic and charming, two attributes that are in short supply these days in music written for film and television. The Midsomer theme, which uses a small chamber group and a theremin, lets the viewer know that though there will be many murders in these bucolic hamlets, it's all very tongue and cheek. His many variations of the theme are what make this exceptional film music and keep it fresh after 13 years of the series!
There is not too much information about Jim Parker on the web, but there is a wikipedia page here: