Before Brexit, the EU Cross-Border Enforcement Directive (2015/413/EU) allowed mutual recognition of traffic fines across EU countries. Since Brexit, the UK is no longer bound by this directive, meaning foreign motoring fines or toll penalties are not automatically enforceable in the UK.
The Cross Border Agreement was limited to eight specific offences allowing foreign authorities to obtain 'owner' details.....
Speeding;
Not using a seatbelt
Not stopping at a red traffic light or other mandatory stop signal
Drink driving
Driving under the influence of drugs
Not wearing a safety helmet (for motorcyclists);
Using a forbidden lane (such as the forbidden use of an emergency lane, a lane reserved for public transport, or a lane closed
Illegally using a mobile phone, or any other communications device, while driving.
The EU is currently considering added further offences.
Since Brexit the CBA no longer applies to the UK.