After France, I went back to the UK with my mom. We slept in London, and took two day trips: one to Windsor Castle, Bath, and Stonehenge, and another to Edinburgh (which the Brits, being Brits, pronounce "Edinbruh." I kept thinking they were saying "Edinborough", which prompted me to take out my phone multiple times and reassure myself that I had been spelling it correctly my whole life, and wasn't crazy).
UK
I was informed by several tour guides in Bath that the water will kill you if you so much as dip a finger in it. I am suspicious that it actually has miraculous healing properties. I didn't chance it though.
The information about stonehenge was all very vague and noncommittal. They were basically able to say "Yeah, there are some graves, and the stones are aligned with the solstices. There are some stones that people maybe thought had healing properties, but we can't really make any conclusions."
I also tried haggis in Scotland. It was not good. Don't try haggis.