Jack and Betty Collins are 12-year-old twins who live in Manchester with their parents, little sister, and grandfather. They go to school every day on a big red bus while their parents go to work, with their father as a factory worker and mother as a teacher at a school near the factory. Mr. and Mrs. Collins have a big surprise for their children - they are taking the family on a holiday trip to Blackpool to visit Aunt Gloria and Uncle James.