The closest beach to London is actually in London: Ruislip Lido, which is easy to get to by tube and bus. It's a large sandy beach surrounded by woods with a café and kids' play area.
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Can You See Underwater on Eurostar. Eurostar trains have nice picture windows at the seats that let you see outside. When you are in the underwater section of the ride you will only see the inside of the Channel Tunnel. You cannot see underwater while riding on Eurostar, so no you will also not see any fish.
Absolutely. You can bring your own food on European and London routes. And unlike in the sky, we won't restrict you with stifling rules on liquids. So why not bring a bottle too.