From my copy of Falklands The Air War it says Neill Thomas (in XZ496) and Dave Smith (in XZ459) were vectored towards in incoming flight which consisted of four A-4B Skyhawks from Grupo 5. The Skyhawk flight split into two separate attack elements......Two were seen by Neill Thomas, who dived at the hostiles and got within three miles of them before being ordered to break off the interception. The book states these Skyhawks were heading for HMS Broadsword.
It then goes on to say the Sea Harrier CAP headed for the other pair, going for HMS Coventry but they were again ordered to break off. Broadsword had locked onto the targets but then Coventry broke the radar lock by coming between Broadsword and the Skyhawks. It does not give a distance between the Harriers and the Skyhawks for that engagement.