What is this tree?

[ideasguy]

I received this email yesterday:

i'm trying to identify a tree which i think is a type of Acer. i have attached a picture of a leave, taken october in the uk.
can you help? The tree was about 50ft in height.
hope you can help
Peter

Heres the photo of the leaf
http://www.ideasforgardens.net/temp/leaf.jpg

Can you help?