Yep. It's a Peugeot 504 alright.
Or was.
Smiffy, there are precious few 504s left in Britain, but those that are still running seem to be kept in good condition. As shown by this one I found on a rather excellent Peugeot web page. To see 504's in action, though, look no further than the James Bond film "For Your Eyes Only", and check out the chase between a yellow Citroen 2cv6 and a pair of villainous Peugeots. (Both of which meet a sticky end!)