This is different. You wouldn't think an episode based on a dozen couples dancing in a grimy village hall would work, but it's actually rather engaging.
The dance marathon itself is absolutely brutal, with the organisers yelling and shouting at the contestants as if they're inmates in a concentration camp, complete with an air raid siren to start and end the dances. What starts out as light-hearted fun ends up as a horrible slog, and by the time John-boy quits, his fellow contestants are wandering the dancefloor like ghosts. Helen and Spanky (yes, really!) are good value, and Spanky's collapse comes as a genuine surprise, so points to the writers for that.
The marathon couldn't have come at a worse time for Olivia, who fears she is losing John-boy to his college friends. As ever, John supports his son's decision, but that doesn't stop Olivia taking out her anxiety on the rest of the family.
There's no Jason this week, although Jon Walmsley still appears in the credits. The remaining children, led by Ben, build their own radio and listen in on John-boy's dance. It's nicely acted, but it does feel very bolted on. Would have been better to have seen them involved in the main plot somehow.