C. Now look in the microwave
Part 1 - C. Your time starts now. Now look in the microwave. Part 2 - R. Now look in your pigeonhole. Part 3 - E. Now look under the doormat. Part 4 - A. Now look in the lab. Part 5 - M. Now look in the little blue book. Part 6 - S (at the beginning). Fastest wins.
Series 7 / Episode 8