syndrome

Driving along a dual carriageway yesterday I came across a tractor towing a loaded straw trailer at a roundabout. I was in the outside lane so proceeded to make way to pass the tractor when an old boy in a Peugeot 205 drifted over into my lane to pass the tractor. As we nearly had a collision...

The door lock has gone all funny and when it locks the pin goes up and down repeatedly. I have searched and fornd it needs a new lock, but would anyone have any idea of a part name or number for this? This is on my 2003 s211 320 cdi estate. Thanks Max