To celebrate Father's Day, and not at all because it was cold and damp, we decided to take the kids to the Natural History Museum to see their new Mammoths exhibition. Truth be told I am not a huge fan of the Natural History Museum. I am purely an arts person, so stick me in any old "regular" museum and I am happy, but all these dead animals and weird plants and facts about nature? Not my cup of tea. Add to that that Yon is not an easy child to take to a museum, and that Ron (like me) is not a huge animal-life fan. And let's not forget the 100 pound rule - I found that whenever you leave the house in London it costs a hundred pounds. How when the museum is free? Well, first of all though the museum is free the exhibition itself costs money (26 pounds for a family) with the mandatory gift (I know it's not mandatory and yet somehow we couldn't resist the sitting mammoth) which ended up costing about 30 pounds and lunch (another 30 or so) and transport - and that is how you get to the magic number.