At just over 3 weeks since pitching, my bitter with Windsor/nottingham had been b fermented, casked, carbed, and cooled. I pulled a sample off the top after it got down to 50 degrees and it had changed from opaque brown to very hazy gold. Tastes fantastic, except for the slightest hint of yeast. No green flavors. With "normal" English strains I would expect it to have been clear for a while already, and ready to drink now or maybe in a week. So the fermentation proceeded as expected even though the slow clearing would indicate a major problem with the yeasts I'm used to. We'll see how much longer it takes.
Honestly, if the beer turns out better than the sample in another week or two, I could see trying Windsor again (I'm not sure the nottingham did anything) despite the slow motion clearing. I could work around it during the summer months, at least if I'm not bottling. Seems like the yeast is letting the malt and sugar and hops do the talking, but there's a soft nuttiness or woodiness there that is quite good, especially with the floral/herbal from golding dry hop.