don't shoot. Have you nothing better to do????? We had an exchange about rostered hours on another forum a few weeks ago and you were wrong then just as I think you are now.
If you are not an ATCO what has it got to do what working practices are used at different units?
I don't question why an airline rosters more pilots/cabin crew for a flight than it really has to and hence the additional cost to the ticket,so why are ATC any different?
I say it to you again. MOST NATS units are working their rostered hours. The "good times" ended years ago. There is little or no slack in the staffing levels. Now s*d off and find a different group of hard workers to have a go at.