I visited this site back in June 2005 and I didn't know then that it is WHS. I wanted visit this site because it's the best place to spot wild parrots in London. The garden was beautiful and peaceful place (after you get used to noises from planes), tube station is located near it and I spotted parrots (and many other bird species)! I spent the whole day walking around the park. My favourite part was the pagoda. I felt like I was in China or Japan.