Hello, I am still fairly new to ATC, I had this scenario yesterday.
EGLL, 27L and 27R taking incoming and departing traffic, they were both indicated active (green) runways 9L and 9R (red).
As I was watching the traffic coming to 27L and 27R out of nowhere came an announce of inbound on 9R ( wasn’t watching that side of the radar). I had an aircraft lined up and waiting to depart with following aircraft on final.
I issued a Go Around and Enter Left Downwind 27L, would that be the correct thing to do here?
My directions were ignored even after I re-issued them and the aircraft landed spoiling the experience for the lined up and next incoming aircraft on 27L.