Oh goody

I haven't been to the Tower since I was junior school age, only to see the outside
Compared to things around here it's good value tbh.
If we have time after and the weather's good (which it will be of course), a wander along the Thames is lovely, there's Tate Modern nearby, or just go across one of the bridges, like the Millennium. I love being on a bridge, you're somehow removed from the rest of London...
It's going to be like a whole holiday in one day
