I just had an unusual long lag with Notty, normally Notty just takes right off for me. But this batch took around 50 hours or so to see any visible signs of fermentation. When I went to check the gravity, there were some bubbles, but not enough to get excited about. 4 hours later, full Krausen. It looks like this batch of yeast were quiet fermenters that are making a sprint to the end. I read in the other Nottingham thread that some people were having it ferment without any visible signs similar to what I'm seeing happen.
This brew was a bit of a bigger beer, but I pitched accordingly and have been fermenting a little cooler than normal, 65F as opposed to 70F. Also, I normally overpitch with Notty since I generally make smaller beers and just use the entire package. Other than a slightly higher gravity and cooler fermentation temp, my process was the same to previous batches.
I'm hopeful that it fully attenuates without any off-flavors. I have had great success with it in the past, so I hope this was just a fluke.