Go back. He said he had a BX then a Xantia.
As did I.
I loved the BX, a naturally aspirated 1.9 RD. Used to drive through Studentville in Manchester and Stockport and all of them tried to flag me down! Both my BX and my Xantia rolled on a hill. The BX was on my sloping driveway and I went home to pick something up. When I came out, it was blocking the road. Always put it in gear after that.
Until the time I forgot (after a tiring long distance run). When I happed to own a Xantia....
It rolled down a long hill and bumped into a VW Polo at the bottom.
My ins co rang the dealer to ask if it had been serviced as per schedule. "Yes", they said. So they concluded I hadn't put it on tight enough. Would not entertain the well-known design issue Citroen had.
To cap it all off, I had arguments with them about the repairs to the Polo: the Citroen was undamaged and there was no visible damage to the Polo. But they had paid out thousands in repairs, including a new bumper and numberplate, which (in the photos I sent them) were completely undamaged.
I suggested there was some kind of fraud going on between the Polo owner and the "repairing" garage, but that got me nowhere. They're a lot hotter these days when it comes to accepting or refusing claims.