I've had a few nice cars where Trackers were demanded by insurers.
The market has moved on and you can now get "low cost" trackers.
They start at £35 with a SIM card but £100 gets you something worthwhile.
No contract just about £3 per month on topping up the card if the car is frequently used.
I'm planning on using mine for work - so it may sometimes be left in places where it will attract "interest"
An alarm seems pointless - a tracker sends a text when its been moved and its meant to be stationary....
www.thetrackr-uk.co.uk/#&panel1-4
this tracker @£24.95 doesn't even need a SIM - works on crowd GPS where all enabled phones search for all devices - so when its out of range of your mobile phone - all other enabled phones will tell you where it is.....
May I introduce......Basil