Oh, dear, ixion - I’ve just checked online and it is £18 now. But I just checked the paper catalogue they sent us - definitely £9 there, and when I ordered. Sorry! Must say I thought £9 seemed pretty cheap when it arrived. They must have made a mistake.
I’ve mentioned this elsewhere - a Plasticene Advent Calendar, one item to make every day. I found it at the RNLI online shop and it arrived today for elder Gdcs, 5 and 6. Rather bigger than I’d expected so seems good value for £9, though postage extra of course.
Just thought some other grandparents might be interested. Website is shop.RNLI.org