Frank and Betty now belong to a local Scottish dancing group. One of them has to stay at home to babysit Jessica, so they take it in turns to attend. Mr Quincy, the lodger from next door, is the organiser of the group. He is organising a display in honour of a visit by the local Liberal Party candidate, Mr MacDougall. He wants Betty to appear, but doesn't have a place for Frank. Frank is part of the welcoming committee which goes to meet Mr MacDougall at the railway station. Mr MacDougall leaves his briefcase on the train. Frank volunteers to go and fetch it. He seems to be taking a long time, so Mr Quincy gets on the train to look for him. Frank gets off the train with the briefcase as the train pulls away. Mr Quincy jumps off and breaks both of his legs. Frank has to take his place in the Scottish dancing display. He loses his kilt at the end of the display and reveals all. (thetvdb.com)