It must have been the mistletoe / Judy Astley.

A family Christmas in Cornwall for the newly single? Thea's parents have split up but still seem to be together. Both her younger sister and her brother are Smug Marrieds. But Thea is newly single and very much wishes she wasn't. When her mother and father plan a great family Christmas in a big house by the sea, the idea is to make it all great fun and tremendously civilised - not remotely complicated despite the fact that what they will really be celebrating is the final break-up of their marriage and the Moving On to new partners. And the new partners will also be there - and why not? It's what they do in Sweden, apparently, and it all works out fine. But will they move on? And will Thea manage to navigate her way through the forced jollities and family disasters to find some happiness for herself?