Any suggestions? Small, clearly ornamental tree, smooth grey bark, drooping panicles of white flowers, flowering now in Oxfordshi

http://i1160.photobucket.com/albums/...0042012333.jpg

and

http://i1160.photobucket.com/albums/...0042012334.jpg

Sorry they're not better photos, they were taken with my small phone camera!

Thanks in advance,

Rachel.