@dp, please accept my apologies for misinterpreting your comment.

There’s no specific data I could find either. The closest guess is to overlay this recent Government report on NEET and the geography split of votes results. If there’s any symmetry here, the implication is that their majority vote was to leave (North East, North West, Yorks & Humber and West Midlands have both higher than average NEET population and votes to leave).