Felicity Kendal stars as the mistress of Luke, played by Jack Galloway, who is married to Helen, played by Jane Asher.

It’s clear that nothing will break Luke’s marriage – but is he really enjoying the best of both worlds?

Luke is on dangerous ground, with both Maxine and Helen feeling they could do with a bit more attention.

Luke is in a turmoil when Maxine threatens to leave.

Luke arranges a free Sunday so that he can make things up with Maxine, but she has other ideas.

Luke realises that he must fulfil his promise to Maxine and spend a whole weekend with her.

Whispering sweet nothings into your true love's ear is an essential birthday treat - but can Maxine look forward to it?

Maxine decides to end the affair – before Luke phones to say Helen is away for the week. Can she stick to her guns?

Having stayed at Maxine's while his wife was away, Luke goes into hospital with appendicitis. Can Maxine make Luke's house look lived in?

Luke finds himself in the unusual position of spending a night at home alone. Why have both his wife and mistress deserted him at the same time?

Luke realises that the only way he can heal the breach with Maxine is by spending a Sunday together. She, however, has other plans.

Luke's wife finds out about Maxine, but takes the whole thing in her stride.