Clouds. Lots and lots of clouds. I did manage to get some (fairly bad) pics during the eclipse, but to give an idea of how challenging it was here in Colyton, the total eclipse phase lasted approximately an hour, and during that hour there were perhaps 3 or 4 seconds of moon viewing time. That doesn't mean clear skies for 3 or 4 seconds, it means I was able to take a couple of dodgy pics through the cloud for those 3 or 4 seconds only.
Worth the effort, but still a very disappointing night/morning.
Just under 11 years to wait until the next one! Well, one that's visible from the UK at least.