Don't let Stoo fool you. You're not going to put on a skin suit and avg 30+mph over 10 miles, let alone 25.
Considering that time is good enough to take 2nd place in the Essex round of the 2016 RTTC classic series, I'd say pro is where you go.
http://www.cyclingweekly.com/news/ra...te-ride-231170