Yes that looked properly inverted to me - RIAT yesterday was fantastic and I hope they were blessed with similar weather today.
It was the first view of a Vulcan for my boys and it brought back happy memories of graduation flypasts at FTS at Linton in the early 80s.
Some fantastic displays this year, the standard was very high across the board - special mention to the Chinook and the Reds.
Not sure wtf was going on with an R44 on the south side at about 500' while the pair of Mirages were waxing the place!