Hi, only just saw this. I highly recommend Pumpkins Nursery - they have two locations, one in Tormarton and one in Badminton. My DD started at the Tormarton one in Jan, and I've been so impressed with it. The staff are lovely, and really helped her settle in. It's nothing fancy, haven't been to the Badminton one, but the Tormarton one is based in a village hall. Still has all the facilities you'd want though, and the children do loads of outdoor stuff. Think it would take about 5-10 mins to drive there from Chipping Sodbury.
I second Pumpkins at Tormarton. Really lovely nursery, friendly staff, great locations. My ds loved it and still talks about it now he's at school. I really hope they have space for my dd when I go back to work.