for Not a boffin, your post #133 ref post #123
NAB, you may well be correct about kg/lbs.
I took the F-35 weights from the graphic at post #123 by Mechta which lists the F35-C (the heaviest variant) as 30,618 POUNDS.
The MTOW for the Mk1 Lightning was 34,200lbs. In the Operating Data section there is a standard profile which states that after a missed approach to a second ILS the planned touchdown fuel is 100lbs per side!