26, basic tenet for basic labour - pay for work done.
Once picked up an aircraft from Aberdeen. The civil instrument fitter for the compass swing was missing. A competent worker jumped in. The shop steward practically reamed him out for doing someone else's work and work for which he wasn't paid.
Had similar issues with civil servants and coffee and lunch breaks; contract mandates the working hours.
Flexibility is an attitude of mind and some people have difficulty adjusting.