21:30Rings on their FingersSeries 1Episode 7: Merry ChristmasBBC One Duration: 30 minutes Mon 17th Dec 1979, 21:30 on BBC One CambridgeshireThe Christmas will be the first that Sandy and Oliver have spent together. They have invited both sets of parents over for Boxing Day lunch... or have they?GenresComedySitcomsSeriesRings on their FingersSeriesRings on their Fingers: Series 1 Source: BBC Online