The best bet, which I have,nt done yet is to look from Kelston hill towards Wales.Gray Hill is to the left of Dundry Hill. Another interesting view is from Brockhams End, past the old roman villa, follow the roman road/trackway down to Upton Cheyney (the I/A hillfort escarpment to your left), as you walk along the trackway Penhill is in front to your left. Seen on old map (1881) 6 stones, must be somewhere in hedgeline, vaguely opposite the nursery, probably disappeared by now, but this trackway must have lead down to river.