I'd recommend Leicester Forest also. I've been going out with the group since mid-April. Two saturday rides, fast ride leaves at 8.30am and goes for 60+miles. The slower ride which I go on leaves at 9am from Desford crossroads, ave speed about 16-17mph and about 40 miles. We stop off at a cafe in Measham or Rosliston.
I'd recommend coming along. If you're on facebook send a message to the group or write on their wall so other riders can expect you.
What kind of distance are you riding at the moment? I would suggest you need a road bike, as you won't find the ride comfortable on anything other. (Think of driving down the motorway in a tractor compared to a sports car).
We're a friendly bunch, and as well as sharing cycling knowledge, we do talk about other things too on the rides!
Hopefully see you soon!