Hi Maurice,
I can highly recommend Classic Tracker Ltd (
www.classic-tracker.com)
All the usual phone app tracking features. If you are travelling you can set 'safe zones' at overnight stop overs plus you have a feature where, if the worst happens, and your phone notify you that your car is being driven away you can isolate, for example, the fuel pump from your phone and the car will slowly come to a stop.
Nick the company owner is a great guy to deal with also.
We can talk about another anti theft feature also next weekend if you like.