airsound
It was a requirement for aircrew to partake of breakfast before flying - though I can't, 15 years later, be specific as to whether that requirement was in STCASI's or 1 Gp ASO's.
I do recall that some 2 -3 weeks after the crash that breakfast arrangements at Northolt for those crews departing on tasks between 08 -0930 hrs were completely revised and a cooked breakfast was provided by in-flight catering after the crew had completed pre-flight planning.
That would have been just after the BOI had presented their initial findings to the AOC.
I would consider that ignoring Orders or Instructions that you sign as having read and understood each month would be deemed to be negligence - as does my copy of Chambers Dictionary.