What was the name of a UK TV detective series which used a Bach Cello Suite as theme music?

I'm trying to recall the name of a UK detective/private eye TV series which used Bach's Cello Suite No.1 as its theme tune. The series was broadcast in, I think, the 1990s and was set in Warwickshire or the West Midlands. Every time I play the music, I'm reminded of the series and really irritated that I can't remember more about it