Please could you post some photos of the foliage and seeds (even if they are old and brown from last year).
Is (was) it alive?
Or is it an old trunk where the outer bark (perhaps a platy bark like many pines, plane trees, and Eucalyptus) has fallen off?
Thanks for your quick response; the tree was alive when it came down last Wednesday.
The tree was in a fairly dense wood so identifying last years foliage will be a challenge but I'll take a good look and take some photo's
You might be able to find some of the foliage/seeds still attached to branches connected to the trunk...
(which would obviously also be more reliable than using leaves/seeds loose on the ground)
Ah - thanks for the extra photos.
The leaves are misleading: they are European beech, Fagus sylvatica.
The buds and trigs are the key: they show it is a maple, and I am pretty sure it is Acer pseudoplatanus, sycamore. You should be able to find seeds and largish leaves amongst the fallen leaves, which will help confirm that - see illustrations here - http://www.woodlands.co.uk/blog/tree-identification/sycamore/.
The bark, as in your original photo, is still a bit of a puzzle. Either it is the inner bark, exposed for reasons unknown; or it is different species of maple, with which I am not familiar (there are over 100 species).