As the number of flashes people estimated last night seems to keep growing, I’m going to officially update my guess to approximately 1,000,005
(the last 5 were once I got home)
in all seriousness though I would say my first guess was wrong. There were at least 10 per minute at the very lowest end of the scale, and up to probably quite easily 50 at peak intensity.
with some rudimentary maths: the storm lasted 3 hours(ish). So 60 x 3 is 180 minutes of action overall.
an average of about 30 fpm (flashes per minute) 30 x 180 = 5400.
I’m going to add another 600 to account for the quite exceptional duration of the peak intensity (and that there were multiple bouts of activity) and round it off to 6000.
I think the poster who claimed well over 100,000 might need to check the filament in their bedroom striplight