hereGail, played by Alison Steadman, is married to Henry, played by Peter Davison, and is about to celebrate her 70th birthday when a chance encounter throws her whole life into question.David, played by Adrian Lester, is happily married to Kelly played by Rachael Stirling, but is faced with temptation when he meets the impulsive Saira, played by Hollyoaks, Corrie and Cold Feet actress Saira Choudhry, on holiday.Pilates teacher Belle’s neatly ordered life is disrupted by the unexpected arrival