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Hybridisation between the common, or pedunculate oak (Q. robur) and sessile oak (Q. petraea)is quite frequent, with the hybrids showing a range of intermediate characters (such as incipient auricles, as one of the leaves here seems to show), so it's also possible that this specimen might be such a hybrid. Acorns on the common oak are at the end of long stalks (peduncles), whereas those on sessile oak sit directly on the twigs: could you see any remaining on this one?
Thanks for the lovely photos, by the way,
I think it was bare but your detailed information has made me want to check again.
Thanks for your help
Lat/Lng: 55.9564, -3.9653
OS grid ref: NS773754