Hello

Can anyone here please help me identify this tree growing near my home in London?

I hope the images are clear enough to see...

These were taken today (30th April).

http://i40.tinypic.com/2a65o8w.jpg
http://i43.tinypic.com/jhx210.jpg
http://i41.tinypic.com/2uo3vyg.jpg
http://i43.tinypic.com/2diivwn.jpg

Thanks in advance