Thanks for these responses, everyone!
Here are links to TinyPic where I've posted three photos, one is a zoom on the leaves, the next is the trunk of the tree, last is a long shot of the tree -- it's taller than the two-story terrace houses around it (it's in someone's back garden).
Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting
Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting
Image - TinyPic - Free Image Hosting, Photo Sharing & Video Hosting