I had a Toad Ai606 Thatcham Category I Alarm system fitted to mine some years ago.

This links on to your existing central locking system to make it remotely operated, and has quite a few sensor options.

I just went with

ultrasonic interior protection and the usual links to anything being opened.

It's been pretty reliable, and would probably go for another one again.

If you want it professionally installed you need to shop around, but I'd expect to pay around

£250 upwards these days.
