Concorde Flights Washington - Heathrow 1977

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My late father flew on the BA Concorde service from Washington (IAD) - Heathrow on the 12th August 1977. Sadly he did not complete his Passenger Certificate with all the relevant information and I am keen to track down which aircraft operated the service. G-BOAA/AB/AC/AD/AE? I believe AF and AG were not in service in 1977. So I am appealing to any former Concorde pilots, flight engineers or cabin crew that could check through their log books to see if they were on this flight. I appreciate its a tall order but it would be marvellous to find out the actual aircraft and flight time, perhaps even have it finally signed by the crew member!