I've not heard how the north sea maritime border wil be settled, as far as I know the current border runs horizontally west to east from just north of Berwick upon Tweed but the land border between England and Scotland runs at roughly a 45 degree angle. The current maritime border is not internationally recognised and the commonly accepted way to set a maritime border is to continue the land border out at the same angle. This could put up to half the oil into UK waters.
Personally I think we should follow Chinas lead on territoral waters and claim everything in the North sea right up to knee depth water at low tide off the Scottish and Norwegian coasts.