A sad mistake. Had DeHaviland/BAe been able to source suitable engines to have made it a twin it could have been a world beater. As it was it comfortably outsold any other UK airliner - ever.
The Russians managed it...they even had the bloody cheek to call it the An 148! No pretence spared there, then!
What's the betting the dolls-eye indicators on that are arsey-versey too?