Remember seeing a Canadian five-ship in filthy weather at one of the Biggin Hill shows in the late 1970s. I have a couple of slides somewhere in storage with a loose gaggle of them all with the reheats lit disappearing into the murk.
The German Navy sent a pair to IAT at Greenham Common too around that time. One would fly past slowly dirtied up while the other went whizzing past at 0.9M or faster