I know this isn’t the place for serious discussion and I may also be a little biased given that I used to walk over the Greenwich meridian outside my office back in the day when I used to go to an office, but Harrison’s clocks were the focus of “a big deal”. It wasn’t just that sailors fancied telling the time; an accurate maritime clock was essential for measuring longitude, so basically his invention paved the way for accurate navigation and mapping of the globe, which is quite a thing.
But no I’ve never heard of Leonard Cheshire.