Best way to protect yourself is keep nothing of major value in the car, make sure you have an up to date and recommended alarm, make sure you have the best locks available protection-wise, in a polo's case, the freewheeling locks if forced. Also, file down your door pins, make sure the windows are secure etc.

At the end of the day, if someone has a reason to get into your car, you can only delay them. If they want to get in enough, they'll get in. If they want to nick it, the usual alarm, fuel cut off switch, ignition deadening switch will do the trick if well hidden. :)

have you got into your car yet ??