Not just the Detectorists tonight on BBC 4 at 10pm, but Part 1 of Digging For Britain (visiting various digs) at 8pm and The Mystery of Rome's X Tomb (2000 skellies discovered in an unknown tomb) 9pm
Not to be churlish (it's very amusing) but showing a standing stone as a good place to detect because medieval monks buried treasure by them was crass.