The DfT publish statistics on reported drink driving as part of the annual Reported Road Casualties Great Britain. This includes data on reported drink drive collisions, casualties & breath tests. The drink drive statistics for 2019 are available here.
The Home Office also publish Police powers and procedures, England & Wales statistics on fixed penalty notices (FPN’s) and other outcomes for motoring offences. Data on a wide variety of motoring offences is available by Police Authority. Click here to access the Home Office Statistics.
For information about safety camera data see this article.