I saw the "Wilson", and I can only think that he was a Mobil Rep, as there were no top riders with that name.
I'd have to check database to see if there was a lesser light......for instance it could have been a local hero to the person obtaining the autographs.

Interesting seeing the names.
Bill Doran, I still speak to his widow Peggy. A works AJS rider, winning the 1952 Belgian GP. Crashed in the TT in 1951 perpetuating the name "Doran's Bend"
Cromie McCandless. Brother to Rex McCandless of Featherbed fame. Won the first 125cc TT, and the Ulster Grand Prix, the last on the Clady course, on a 500 Gilera.
Jack Brett. A Leeds lad, a big drinker, and a real trier on any race track, and was on the rostrum on works Nortons on more than one occasion. His brother Charlie Brett who also raced ran a fish shop in Leeds.
Maurice Cann. AS big Guzzi man who was supported by Austin Munks of MGP fame. Involved in one of the big dramas of post war TTs when the timekeepers allegedly made a mistake and declared Cann the winner over Manliff Barrington, (sponsored by Stanley Woods), in the 1950 Lightweight.
Bill Lomas, a top trials rider who won the 1954 Travers Trial, and was the first man to win four silver replicas in one week in 1955. He made his name on a home made Royal Enfield with four valve head in the late 40s at Cadwell Park. He was 350cc World Champion in 1956, but crashed early in 1957 and the collarbone never healed properly, (he had a healing problem), so retired there and then to run his motorcycle business in Clay Cross which is still run by son Tim.