P421ORACLE 421 Mon17 Feb C4 1702:13     SEVEN KEYS    Tuesday, February 18, 2.30pm Alan Dobie plays an ex-convict in this brisk British 'B' feature crime thriller. He elicits the help of Jeannie Carson to solve the mystery of the bunch of keys left to him by his embezzler cell- mate. However, the couple's attempt at amateur detection runs into problems... Duration: 65 mins (1962 b&w) NEED A H/LIDAY? *** 580