Tagron. Yes, stopped it for just about everyone except an RAF VC10 which had brought in a VIP earlier. When asked his minima for take-off he replied "I do not have a minima"... so take-off he did!!
We used to get nervous in poor vis that the oncoming watch might not make it so we used to wind the ASMI out and watch if there was traffic on the M4.
We must have spoken many times. I started at Heathrow in Jan 1972 and retired in Nov 2002.