Mentioned by urbanest
The 10 Best Parks in London for a Picnic
"For any list of the best parks in London, it’d be a crime to ignore Hampstead Heath. Closest to the Hampstead Heath overground, or the Hampstead station if you’re going via tube, here you can enjoy your sandwiches on top of Parliament Hill while taking in stunning views of London. It’s even got its very own swimming ponds should the weather be particularly nice."