That's a bit of a bummer, but at least I know what it is now! I've got all the volumes of Trees and Shrubs Hardy... at work so I'll flick to page...
Thanks Michael. I haven't been able to find much info about the Q.cerris f. laciniata online. Is there any links you know of?
I found this small Oak growing amongst 4 others, which in turn where growing around a large mature Quercus robur, at the arboretum I work at....