Went to open the Red Lupo yesterday - turned the key, door unlocked, key stayed were it was and the windows start to go down. The key had jammed in the lock, so took off the door handle to find that one of the door lock components had broken. It's a circular piece of metal but not a complete circle, if you know what I mean. I had a look in a Haynes manual for a Mk4 Polo (which has a very similar lock assembly) - they refer to that part as a 'coupling plate'. Has this part failed on anybody else's Lupo, and if so do you know the proper description for it, and the VW part number and cost? Cheers, Brian.