gets too close to it on final and has to go-around, there being no 'land afters' allowed at a FISO airfield.
Chevron
I understand that but its not exclusive to aircraft joining down wind its up to pilots to create a reasonable seperation. Once out of the OH and down to circuit height in the pattern the same problem can exist.
Flying mainly twins in the past I often had to create a separation to a slow aircraft in front and there are many techniques to do that even on final with one ahead.
Go arounds are usually created not by getting too close on final but the aircraft which have landed thinking they have all the time in the world to clear with little consideration to other aircraft on final?
Pace