Rachel and Cuckoo learn that their nude Thai wedding ceremony on the beach wasn't as legitimate as they believed. This comes as welcome news to Lorna, who is pleased she's going to be witnessing her daughter's marriage. Ken sees this as an opportunity he's been looking for for ages which is a final chance to get rid of his son-in-law, once and for all.
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.