Just saw this on Youtube, and wanted to comment that the previous review from 2009 seems to be a fairly inaccurate summary of what happens in this episode. It's pretty clear that the agent that Hancock sees doesn't "accept his claim"; he just tells him to keep investigating and gives him the number thirteen just to get rid of him, and the "Canteen" whose phone number he gives out is a local restaurant, with no connection to M15 or any spy agency. This is a funny episode, maybe not as well written as the classic Galton and Simpson shows, but, as always, wonderfully performed by Hancock. The episodes of this show that I have found on the internet seem to indicate that it is underrated.