A couple of months ago it was a 73-300 sim at CTC in Southampton although it will be any sim they can get at the time.
They'll send you a briefing sheet with profiles, speeds, power settings etc.
The detail was straightforward, all raw data and manual thrust to confuse the bus drivers.
SID, some general handling, steep turns, accelerating and decelerating in the climb and descent, then a procedural ILS and go-around.
If it is for the LHS there will then be a brief LOFT excercise.