stilton, Brian Abraham,
Just Googled this to confirm a less-than-certain memory.....
Today, only the 737 (later variants) has a HUD fitted.
Not sure if it's a standard fit, or a customer option.
CJ
PS : off-topic, but the Mercure was a nice aircraft, even rarer than Concorde (incl. the prototypes only 12 built).
One is at the LBG museum, looking immaculate, and being kept "alive" by volunteers, but of course out of hours.