To answer the question of wether it is east to break ino cars or not.
I used to work for one of the breakdown orginisations in the past, and we had to break into many cars. Vauxhalls in general are no worse than any other car for gaining entry. In fact the hardest 2 cars of the time where the Mondeo and the Cavalier mk3 (if deadlocked, and yes people did manage to do it).
The trouble is we had to break in without causing damage, the average scrote will just break a window which is very easy on any car.
The mk2 Astra had a reputation for being easy to break into, and the scrotes would attack the door lock bit where the key went in, it goes to show how stupid they are as the mk2 Astra could be opened with a flat blade in about 5 seconds and cause no damage.
Friends in the no, tell me the easiest one today is the Discovery, it is so easy that Land Rover insisted the breakdown orginisations break a window and Land Rover will pay for the replacement glass

Mike