I'm not sure if anyone posted this at the time, but a couple of weeks ago Radio 4 did a fascinating series of programmes on the Oak tree. I've only just got around to listening to it and was so impressed I'd thought I'd share it! There are 5 programmes in total and you can 'listen again' here:
http://www.bbc.co.uk/radio4/science/oaktree.shtml
Mat
http://www.bbc.co.uk/radio4/science/oaktree.shtml
Mat