Martin Sykes wrote:
I want a tree for my front garden which will provide all year round
interest:

Maximum Height: about 25ft
Maximum Spread: about 20ft
Quite light airy foliage which won't cast too dense shade
Soil is about neutral and reasonably fertile, having been an arable
field up until 3 years ago.

I'm looking for good colour all year round from a combination of
flowers, leaves and/or berries. Possibly something native to be
maximum benefit to wildlife. If that's too difficult, I'd consider
combining it with come nice climbers.

Not much to ask but any suggestions?

Betula jacqumontii - ideally as a multi-stem as you can then cut out any
getting over your 25 foot limit

http://www.hort.net/gallery/view/bet/betja/


google for loads of images.

IMHO the best tree for year round interest.

No berries but hit the other points

pk