Having flown to Gib for over 20 years it can be a very tricky day out. I doubt it was a failure that caused them to go around as they would have initiated a go around earlier. Only the crew will know if it was pio as a result of the windshere or something more. Winds can change very rapidly and the wind was 090/30g35 it only needs a couple of degrees towards the rock and it would be out of limits. We landed a few minutes before and there was little turbulence but this can change in an instant.