It's all about different budgets with different managers I think.
MoD civilians in my time had a great time [not] with detachments because "Travel and Subsistence" had nothing to do with financial matters such as overtime [for juniors], long hours gratuity and shift/ weekend/PH allowances.
This in an era when many juniors had to rely on public transport, and many had no telephone. To ask an off-duty observer to turn out at no notice to cover a night shift for a sick colleague, pedalling 10 miles on a sh1tty night, and no recompense, was iniquitous. And yet I never knew of a failure to cover a shortfall. I wonder if today's youngsters would stand for it. In a way, I hope not.
There some grave injustices which simply invited dishonesty, with the inevitable consequences.