Bill, I'm set for the Sept 13 tour date.
Thanks, eef! The bus I am planning to take is http://www.thestonehengetour.info/route It runs a loop from 10AM to about 6PM with stops at Stonehenge and Old Sarum. Your ticket is good all day and if you purchase the Stonehenge entrance ticket thru them you get access without having to have a timed entrance there. I, too, was last at Stonehenge before the new Visitor Center and the trams or trolleys or whatever they are that takes you out to the stones.
I have been dithering about this accommodation for a couple of weeks and I am not sure why! I did go ahead and book Cathedral View a short while ago, got an immediate response back from the owner with additional info, then another email with attachments of a walking map from the station to the B&B, restaurants, sights, and suggested itinerary. Seems very efficient and I can leave my bag there before check-in. They do cash only, so have added a reminder to self on my itinerary to get extra money out of the ATM in London.
I thank all of you for your input! Now it seems like there is enough to see that I might need to spend a week, lol!