Well I did the sim check about 14 months ago on the 1-11. The day went something along the lines of:
Report to the 'welcome centre' where you would meet your fellow person being checked, easily recognisable as the only very nervous looking person sitting on their own at reception!! Then the pilot pitched up who was conducting our simulator check to take us over to the simulator building for the briefing. The checker can be a captain or first officer from any of the BA fleets.
Briefing consisted of a quick rundown of the sim check. Each of us were told to expect one sector as handling pilot and one as non handling pilot. Each sector would consist of 1 - 1.5 hours of flying which included a 10 minute 'get the feel' of the simulator at the beginning which was non assessed. The instructor then gave us a brief look at the layout of the flightdeck on the wall and explained the main points like how to transmit and the location and workings of the radios/navaids and autopilot. We were then given all the plates, wx and flightplans and given 10 -15 minutes to brief the first sector which for us was Heathrow to Stanstead consisting of a SID leading straight into a STAR. The second sector was Stanstead to Manchester.
Into the sim then and the other guy went first. He did the practice 10 minutes first which involved a normal takeoff, sim then repositioned onto final and a manual ILS flown to landing. The the official check started. We took off on this very short sector and from the moment the wheels went up the pressure was on with maginal wx reports coming through, loads of RT, an unexpected hold before an NDB approach into STN. We got it on the ground although it was not very pretty. No break and straight into my sector as handling pilot. Same practice session as above then into the flight. Normal takeoff, SID and into the cruise, around 10 minutes into the cruise the instructor (acting as cabin crew) stuck his head between the seats to tell us that the galley was on fire. Organised a diversion into Birmingham and worked flatout to get it on the ground in one piece. Once again not pretty but we got it there. And that was it, we had to debrief each other but recieved no feedback from the instructor.
Main points to note: The flying skills were secondary to the CRM skills, both of the scenarios were put together purely to see if we could work as a team. It would not be possible to fly it on your own, so make use of the other guy, get him to tune the anchient radios for you and discuss your thoughts with him but don't be afraid to just make the decision if required (like a fire). You will not get technical faults as they know you are not familiar with the workings of the aircraft, everyone I have spoken to has had one the following DIVERSIONS due to wx, fire on board, or destination closing. SHORT SECTOR to evaluate how the team works under pressure. PROCEDURAL pressure such as unexpected holding or downgrades to non precision approaches.
Each instructor is different and can put together his/her own scenario so expect the unexpected. If you stuff up the flying don't stress just correct the mistake. MAKE USE OF THE OTHER PILOT, LISTEN TO WHAT HE HAS TO SAY but make your own decisions. Only use the autopilot in straight and level, it just complicates things in other phases, I have seen C152's with better autopilot systems. WORK AS A TEAM AND HELP EACH OTHER THROUGH. Try to relax as the instructor wants to pass you through the check.