magp1e
He was instructed to go-around, but gave the wrong response "maintain centreline", hence the amended instruction.
Sorry but you are wrong - he reported number one (as advised by ATC) and was instructed to
"golf bravo bravo roger and er
maintain runway centreline but go around er circuit height one thousand feet there's fast traffic behind to land"
which was amended to
"er golf bravo bravo disregard that just take a left turn and fly north I'll you back in very shortly".
Just what does 'I'll call you back in very shortly' mean? And having been told to disregard the 'circuit height one thousand feet' what heightt was he expected to maintain? The height he was at when he turned? So he is now turning off the final approach, away from the airfield at a critical stage of flight, at a strange height, over a built up area with no clear idea what to expect next. Should he climb against the apparent instruction to just turn north? How long is 'very shortly'? Where will he be expected to re-intercept the glidepath and at what range from the airfield? It is for precisely these reasons that standard procedures are used with standard phraseology so that pilots (and controllers) instinctively know what the situation is and what is expected of them.