That was my understanding of it too, and having owned both albeit for a limited time with the 406 I have to say the 406 rode very nicely for all it's metal curly things and felt pretty well put together for a Pug branded bit of kit (IMO they've always felt more plastic-y than Cits). Xantia is still an order of magnitude more solid feeling though. Perhaps this was down to the mileage gap (406 on 275k Vs Xantia on 97k).
Would be nice to see Hpn suspension make a comeback, still surprised they've ventured away from it what with the rise in broken coil springs over the last decade or so as I feel it'd be a selling point to people tired of replacing springs every other MoT. Looks like our next choice is either Toyota or an old Roller once the Xantiae are no longer practical to keep running. Either that or the flying cars that'll be around by then