DJ,
Does one really want to get up at stupid o'clock of a morning when they might have a 5pm connection out of London or they might be going to the opera or theatre in London for the evening and have a hotel that they might not be able to check-in to until after 2pm of an afternoon?
Lo-Co's operate filghts at stupid o'clocks for, often, stupid fares, NQY is not a LoCo route, it is a business route, the Cornish can be extremely faithful folk, look after them and they'll look after you, so why not operate flights when people actually want to travel?