Sorry West Coast, must disagree with you I'm afraid.
I've been an ATCO for a looooong time and I have no compunction about sending round an aircraft if I think it looks dangerous. I've done it a fair number of times and will ( hope) recognise the times when I will do so again.
NATS actually have a system, built into the aerodrome radar which checks the alignment of an aircraft on short finals. If this gives out a warning then ultimately the controller has no choice but to send the aircraft around. Failure to do so would get him in the office pronto! (Unfortunately this does not give warnings in the vertical sense, only lateral.)
BTW NATS needs money...anybody want to buy a version!!!
In case you're interested I've sent aircraft around for many reasons, including trying to land without u/c down, trying to land at another airport!, and trying to land on the Terminal Building!
Keep flying - I need the wages!!