Much in light of this thread I'm debating doing the Stortford 10 mile race later next month in Hertfordshire, England. I'd personally be aiming for at least a 55 minute time, though it would be my first 10 mile only race that I've participated in, so a result near that would be a learning curve for future efforts regardless.
En-route to my HM a few months back, 10 miles was passed in 57:30, but going somewhere in between my last 10k time, my view of current fitness (being that I feel it's better), I still think 55 or maybe better is achievable.