It was one of the four-ship put up c. 1971 by ULAS and photographed air-to-air by "Air Visual', one picture of which was subsequently published in Aeroplane Monthly. I have some of the shots.
Only flew WD 345 a couple of times myself ,Oct 31 '71 Solo and Sep 21 72 on an IF continuity trip, before poking off back to the Towers.