Rose carefully dropped three pound coins into the large collecting box at the entrance to the British Museum. Her mum tutted. ‘What d’you want to go and do that for? You don’t have to pay.’ ‘It’s a donation,’ Rose pointed out. ‘They suggest you make one.’ Jackie raised disbelieving eyes towards the huge domed ceiling. ‘That’s only for people who haven’t been dragged here against their wills on a Sunday morning.’