Thanks genghis,
Excellent points, I was thinking it was those reasons you gave, the only thing that was making me doubt it was at the of the dive I am told to clean a/c then find field and use gear/flap accordingly, but if I put the gear up I may not be able to get it back down again which I have always thought odd!
I agree with the focus on engine fire a bit much, probably better to do a ones you mentioned, maybe even generator failure, leads to smoke in cockpit, leads to electric fire, then motor etc. This multiple failure technique was given to me in the university air squadron many moons ago