Try a ten-hour Gatwick-Barbados over the Atlantic.
What about a 40 minute London-Manchester in CAVOK? Still flown by airline captains I assume. I think you missed the point about the responsible job bit. A 125 driver is still responsible for the lives of hundreds of people, I'm not saying that he would have the requisite skills to bring a 747 down in a blizzard at JFK, but then an airline captain wouldn't have the requisite skills to drive a 125.
I'n not an engine driver by the way.