British TV has become something of an obsession with me. First it was Downton Abbey quickly followed by Sherlock and Inspector Lewis. Then Call the Midwife, followed by Foyle’s War. Now I am cheerfully glomming my way through New Tricks. This comedy-drama follows the work of UCOS, a fictional part of the Metropolitan Police Service that concentrates on what we in America call “cold cases”. It is made up of retired police detectives who re-examine old cases when new information comes to light.