Looks like CF78 did sell after all ! Sold for £53,750 inclusive of Buyer's Premium
Only other AC in the sale was Ace Bristol BE1059 which achieved £106,000
This auction was held at the Goodwood festival of speed so plenty of interest in the cars, was good to see a display of AC's along the drivers walkway.
No AC's competing, I guess most cars would have been at Classic LeMans. Seems really daft to organise two premier motoring events on the same dates.