I recall the story of the Mk 3 at Farnborough. On day 2 the second aircraft departed and the the first landed. On day 3 the first aircraft for and the 2nd landed.
They had spent 24 hours trawling up and down the Channel turning Avtur in to noise while the crew got scurvy and grew beards.
I wondered why they didn't work up at St Mawgan and have a few beers and not shave or change .