Going to London in two weeks, any tips on science-y places/museums?

I'm currently studying for a Physics BS (first year) and I'd like to go to some place interesting regarding math, physics or science more in general. I'm thinking to check out two exhibitions at the Science Museum (Mathematics: The Winston Gallery and Illuminating India: 5000 Years of Science and Innovation), the Wellcome Collection and/or (depending on time available) the Natural History Museum (I didn't see much last time I was here). Do you have any tips on something more specific or interesting? I've not been able to find any interesting lectures from Universities there (but I may not have looked that well) but if you any suggestions they are welcome.

(Hope this subreddit is appropriate for this post.)