Anti slim jim plates for the doors (will fit both front & rears):
191 837 273 - rip plate - left - £3.07+VAT
191 837 274 - rip plate - right - £3.07+VAT
Basically what you do is unbolt the door lock block, and it slips into the hole. They only go in one way, which becomes obvious when you do it as there are 2 holes in it that the bolts pass through

God knows why they called it a rip plate, probably why the dealer can never find em! I'll put em in the Part # thread too.