30 Jun 1965 : Season 6 Episode 52

Emily leads the trip to the Blue John Mines with Dennis, Sandra, Irma, David, Hilda, Stan, Charlie, Minnie, Albert, Elsie, Len, Jack and Annie in attendance. Arthur Walker looks after the pub. The residents view the mines, 850 feet below ground level. Irma grows frightened of scaring David off. Dennis escorts Sandra. Lucille sees Harry off at Liverpool. On the coach back, David presents Irma with an engagement ring from the cavern. She accepts it.