Hobbies / Books   (Gardening, walking, books, films, theatre etc.)

Can anyone please tell me the name of a tree which suddenly sprouted up in my back garden a few years ago. I'll give as full a description as I can, but I can't photograph it as I no longer have the use of a camera.

It is now approximately 45/50ft tall. The trunk's girth is around 12", the branches are very thin and, now that spring has sprung, it's displaying tiny white flowers.

I've tried looking on the internet, but there appears to be nothing like it - in the UK anyway - but I could be missing something. I'd just like to be able to put a name to it.