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I often saw them fly when I was a boy up north in Lincolnshire(?) IIRC. That was probably in the early 1960's and there were often several at once. I remember being completely awestruck by them. The experience may even have been what started my enjoyment of any loud and powerful machine, steam railway engines included. Seeing a steam locomotive weighing over 100 tons pulling a train of carriages at approaching 100 mph is something I'll never ever forget!! I can see and hear it all now, in my memory as if it was 5 minutes ago. But I can hardly remember what day it is most days!
These 'things' like the Vulcan and Coronation class steamers are not merely machines - They are very much alive!