Mr Swiss Control wasn't the first to validate whilst 23 was in use but he did it while I was Watch Training bod on X Watch, TC.
I may not have been the first but as I drove down the M4 on a rainy morning in (May?) 1983 for my approach board and saw the traffic coming from the left my first thought was s**t!
That was in the days of ILS on 23 and I have many memories, most of which have been repeated here. I do remember getting 5 aircraft within 10 miles from touchdown, using 3 miles spacing when there were departures and an Egypt Air A300 touching down at Block 85 and using the taxiway at the end as a high speed turn off (sorry, RET!).
SA