Replying to John :
I have a security device and tracker in each of my cars. These not only immobilise the ignition and fuel supply, they also set off notifications at the tracking company HQ when it is moved without the ignition being on, or if the battery is disconnected.
The devices are real time, show the precise location (and a few other items) on a smartphone app, and have been reliable to date
I had another car (Landrover Defender) with the same tracking device (but not the immobiliser component) that was stolen last year. I discovered the theft at 18:30, contacted the police (took almost 3 hours….) and the tracking company thereafter. The police were pretty dismissive about finding the car, but the tracking company was in touch with them and within 20 minutes I had a call that the car had been located.
I met the police at the car by 22:30. It had been driven about 20 miles from where it had been stolen. Thieves leave cars in a quiet spot for some time to check whether there is a tracker. The ECU had already been reprogrammed so my key would not start it. I had to recover it on a low loader and have the ECU reprogrammed to match new remotes.
If I had not had a tracker, the car would have been gone….without a tracker the UK police have no means of finding a stolen car.