About 50 in all. And I'm on a 10 Mbit link, possibly on a slower link it would not have triggered. More than an hour has passed now, I think I'll give up for the day (3:50 am here anyway) and hope that by tomorrow things will have normalized.
What a silly situation to be in.
I could change my IP by calling my provider but it is also entered in a fairly large number of ACLs that will not be updated automatically.
Thanks for the tip!