On Wednesday, 6 June 2018 19:58:52 UTC+1, Cynic wrote:
We've got simple cctv cameras with IR illuminator around the lens up
at the local hall. Lately there's been a problem with boy racers
gathering after dark in the car park and antisocial behaviour ensues.

ANPR cameras can be hired, eg
https://www.mobilecctv.co.uk/anpr.php

although the cost may be more than buying one. Many police forces or councils have raplid-deployment relocatable CCTV cameras. Possibly if you involve local police liaison or councillors you might get them to put one near the hall for a while.

Or if you have a local security business with one they might give you a free loan.

Otherwise if volunteers can remotely access the cameras and keep an eye, on a rota, and call the police when something is happening, you may get a result.

Owain