100km!! Over the moon to have that ticked off the list. Really tough at the end, but felt like a really good ride overall. Got my fuelling alot better than I did in previous rides which at last enabled me to get it done.
Congrats!
I genuinely believe, if you have the fitness to ride 100km, you have the fitness to ride 100 miles. In my experience pushing yourself beyond 100km becomes more and more a mental battle, rather than physical.