I beleave the procedure would be Flaps up (to the position recommended by the manufacture) followed by the gear (at a positive rate). Flaps up to get rid of the drag and preserve lift, coordinate with pitch to stop descent, follow with gear up (+roc) just incase aircraft sinks slightly (assuming close to ground) Rather roll the wheels slightly rather than re-skin the belly. Then climb to get away from the ground. Here in the states you are supose to track to the right of the runway after the go around. Lining back up might be tough at this point.
Why did you go around? Aircraft on runway? Might hit it. Bad approach? Do you really have the aircraft under complete control now?
If the engine does quit and you have to land it, you may be better off with the gear up. If you land on something other than pavement, having the gear up reduces the chances of the airplane flipping over. Even on pavement the airplane will slide nicely. Their are design consideration built into the fuselage for gear up landings.
Its good to think about what could happen and what you might do if and when it happens. That way you have already formulated a plan!