For campsites around the Longmynd then look up Brow Farm (close to the Bridges pub at Ratlinghope, not far from Stiperstones)
The Green Caravan Park at Wentnor (shop near by and nice pub up the road and a ok-ish pub onsite)
Small Batch campsite in Little Stretton (close to Church Stretton, 2 great pubs 50-100m away)