HD your condescension is appreciated as always. I note your handle says Director. Do you have any experience flying aircraft?
And yes I have ATC experience at at least one airport very similar to Gatwick. I understand the pressure to move the traffic, but if you're issuing landing clearances / go around instructions crossing the threshold you're running it too tight. Make a call earlier for the go around or expect the unexpected from the pilot. He can't read your mind (thank god)