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Tim I really like the scene you are portraying, however I have never seen an Oak that is bent over like that. There are other trees that do grow this way, Willow being the first that comes to mind. My first impression was that it was a wind swept tree growing on high open ground; however that would not work with your idea.
CMOT, I suggest you get out to the many ancient woodlands and forest in the south west, where you live, and you will see many disfigured oaks. There are many reasons as to why trees become disfigured and some of these reasons are disease, storm damage and sheer weight of the boughs.
Tim I think that the tree should work quite well, but you should remember that only low level scrub would survive under a tree, perhaps some bramble or bracken would work, or a small shrub, there would also be a lot of leaf litter no matter what time of the year. As far as I'm aware it's similar to the states really though obviously the scrub plants are a bit different. And that's where google comes in, there must be some photo reference on google somewhere. Same goes for the critters. All in all though keep up the good work.