Heh, as a ex-South African (and a carjacking victim a few years ago), I can't believe this is happening in the UK now.
Interesting reading this thread, I had these security tips sent to me by E-Mail by my Home security company when I stayed back in South Africa:
Safety Tips when entering your vehicle and whilst driving:
1 Have your key ready, but not visible.
2 Inspect the outside and inside of the vehicle before unlocking.
3 Know your destination and directions to it, and be alert should you get lost.
4 Always drive with your windows and doors locked and/or closed.
5 Make a mental note of any Police Stations in the vicinity while driving.
6 When dropping a passenger off, make sure that they are safely in their own vehicles before departing.
7 Avoid driving through high crime or unfamiliar areas.
8 Avoid driving late at night at/or the early hours of the morning when the roads are quiet.
9 Drive in the centre lane away from pedestrians where possible.
10 If possible, never drive alone.
11 NEVER, EVER pick up hitchhikers.
12 Never follow routine routes when driving; change on a regular basis.
13 Do not leave windows open more than 5cm.
Hope this helps...