Hi Guys. Thanks for all the replies (so far). As I say in the OP, I'm afraid that I'm all too aware how apparently easily most vehicles seem to be stollen these days. I was in a brand new, tech-laden Range Rover Sport a year or so back (quite a transition, eh..?) but, despite living in a low crime area, I got very nervous when I started reading reports of the dreaded key cloning, etc. It was one of those that you could just walk up to with the key in your pocket and open - very weird until you get used to it! So I got rid - and pretty much got all my money back as the waiting list was still long enough at the time! But I'm just not 'posh' enough for such things and I felt awkward (and nervous) every time I was in it.
So, enter my lovely 90! Completely tech-free (in comparison) - but seemingly almost as desirable to thieves! I'd like to hang on to it if I can as I'll never replace it if it gets nicked. She was a November '15 build so one of the last ones - waited until March to get her on a '16 plate.
Most of the time, if someone wants to nick a car they're going to get it, no matter what you put in place. All I'm trying to do here is just put them off visually. As I said in the OP, I'd rather that they didn't smash their way in and THEN be presented with obstacles. because it seems that the Great British Public don't always 'get involved' even when they see something very wrong going on....!