FFB Why would you have to go around unless you were on final and hence how could someone barge in on final unless they overtook you? A go around is a final procedure usually on very short final or when unable to land not a base or downwind procedure! I think I know what you mean
Pace, please don't teach me how to suck eggs! I will Go Around whenever I deem it is necessary to maintain safe flight.
The issue of a/c on long final having right of way (or not) has been flogged to death already. You are entitled to your opinion on this issue but I do not agree.
Also it's nonsense to say you can only Go Around from final - you can Go Around from the beginning of the downwind leg or base leg if you need/want to.
I also agree with Shy Torque that any extending should (notwithstanding local noise abatement) be carried out upwind and
not downwind for the reasons Shy has stated.