Ken is keen for Sid to go to private school, but Lorna is dead against it. Can Ken change her mind with the help of new family member Ivy? Ben introduces Tash to Rachel for the first time, and they get on like a house on fire. A little too well, maybe?
When Ken and Lorna collect their daughter Rachel from the airport, they're horrified to learn that she's returned from her gap year with more than just a henna tattoo and braids in her hair.
At the arrival gate, she promptly introduces them to her new husband, Cuckoo - the squared-jawed, self-appointed "spiritual ninja" who is now their son-in-law. Cuckoo is every parent's worst nightmare - a slacker full of outlandish, New Age ideas.
Ken and Lorna have no choice but to welcome him into their family home - and if every Englishman's home is his castle, then this hippie has stormed Ken's fortress and plundered everything, most unforgivably, his princess.