Ah - a favourite Cyprus - UK sim scenario I used to employ. At pre-session briefing, ask the crew what fuel they wanted. Then delay their climb with a tech snag such as flap/slat fails to retract; after they've resolved that let them climb but fail an altimeter air data unit to give an 'error' flag. Then sit back and watch the debate. Do they know the rules? Can they work out a plan to achieve destination. A top of climb fuel check would show them to be 'below the line' on fuel - do they know how to calculate reduced contingency fuel? Once they'd sorted themselves out, give them an engine failure/loss of hydraulics and let them manage a diversion to Iraklion. Short, busy session with lots of CRM aspects - and no access to ACARS etc. Most found it very useful - and they were then very well prepared should they have an RVSM problem for real!