2. Bettany bolts off round the corner while I am paying for my cup of tea. I send the boys after her. By the time I've put my cup somewhere safe and caught up Alec and Anthony are escorting her, with her arms held high, out of the toilets, one on each side.
3. At the bottom of the slide, with Bettany laughing between my knees and Alec already asking to go again, I can still feel the writhing anxiety I felt at the top of the slide.