To celebrate her husband's 50th birthday, Fiona organises a camping weekend with friends Kerry and Adam. Her meticulously planned trip is thrown off course by the arrival of Tom and his uninhibited new partner Fay.
As the group settles uneasily into the weekend a visit to the beach results in a trip to A&E with Archie, Robin and Fiona's mollycoddled son. Tom and Fay have noisy sex in the changing room of a shop.
Fi is furious when Tom and Fay give Robin the gift of a fishing trip, as she had planned for the group to visit Monkey World. While Fi pops off to visit the primates the rest take to the seas. Meanwhile Tom and Fay try to score some drugs.
Robin uses the fact that it is his birthday to try and re-ignite his and Fiona's sex life. Tom receives some bad news about his estranged wife.
The not so happy-campers put on a talent show to celebrate Robin's birthday, but Adam's flirting with Fay and some experimentation with Fay's stash of drugs sees everyone's deepest desires emerge.
The holiday from hell descends into its inevitable conclusion as Adam 'falls-off-the-wagon' and Robin's birthday party degenerates into blazing rows, substance abuse and awkward sexual encounters.
