Use highly visible security i.e. Thatcham-approved steering locks and devices. Steering locks are one of the best sources of crime prevention.
If your vehicle doesn’t have one, invest in a Thatcham-approved Alarm & Tracking System
Register all valuables (sat navs and dash cams) on Immobilise
Consider investing in a locking petrol cap or locking wheel nuts
Ensure vehicle software is up-to-date and ‘recalls’ completed – check with dealer
Check with your dealer what latest security measures can be retro-fitted to older vehicles. This can often cost less than your insurance excess
Look into protecting ‘passive entry’ vehicles against a relay attack here. Search ‘shielding for car keys’ to find out more about Faraday pouches.
At home – consider investing in CCTV or security lights
https://www.northwales.police.uk/cp/crime-prevention/keeping-vehicles-safe/vehicle-safe-and-sound/