Hope you are having a blast. Just thought I would mention to you that I have a sand collection on the go. I display it in my bathroom. If you have a chance to collect any sand for me I would absolutely love that. I need about 1/2 a cup per location. Most people who bring me back sand put it in a plastic baggie. Of course labled with where it is from. Also I know that you are packing light, if this is not possible, I totally understand.
Happy travels, Leann Nathan and Kayden
Dod
I bet their is a lot more to see and do in London for you 4 days their than you thought.