S3 E18 Up the Crick Without a Piddle

Despite having no memory of this episode at all, Kim, Guy and Richard soon warm up to it, and all agree it is one of the very best episodes in the entire series. There is a surprise appearance from the late, great Sam Kelly, reprising his role as Hans – only this time he is working for British Intelligence, and the whole episode is helped along by some stirling performaces from a range of guest artists. Definitely one to watch.