There's also running based at Northwood Stadium I think. That's where city athletics stuff is based. You could also check out Bourne Sports which is in stoke as they've got posters etc up for clubs etc.
As you will no doubt have found, Stoke area is basically bl**dy hilly! Trentham lakes and country park are good for off road, Westport lake is flat with a fig of 8 round both lakes being approx 2miles, Knypersley Reservoir is a lovely trail to run and is approx 2 miles if you go right around the main paths for all the bits of the reservoir. All of these have parking at/ nearby but not v good for lone females!
I've also found the towpaths along the canals are good, but again are a bit secluded.
I think as well that Total Fitness gym at Trent Vale (London Rd out of Newcastle) has a running club as well as v good pool etc if you're feeling rich!
Dimensions council leisure centre in Burslem has circuit training on Tuesday evenings for some extra training too.
Hope this helps.
I came here 9 years ago, and somehow ended up staying: you know you've really settled when you start turning plates over to check they're local!