I err...... guess the article was about Velocettes.....
 
Date     Capacity     Make of Motorcycle     Grand Prix & circuit     Average Speed
1924     600cc     New Imperial (980cc)[17]     Ulster Grand Prix, Clady Circuit, Dundrod, Northern Ireland     72.71mph
1925     600cc     New Imperial (980cc)     Ulster Grand Prix     65.26mph
1927     500cc     Norton     Swiss Grand Prix, Circuit de Meyrin, Genève     
1927     500cc     Norton     Belgium Grand Prix, Circuit of Spa-Francorchamps     
1928     500cc     Norton     Grand-Prix de L'U.M.F, Bordeaux, France     
1930     500cc     Norton     Ulster Grand Prix     80.56mph
1930     500cc     Norton     Grand-Prix de L'U.M.F, Pau, France     
1931     500cc     Norton     German Grand Prix, Nürburgring     
1931     500cc     Norton     Belgium Grand Prix     
1931     500cc     Norton     Swiss Grand Prix, Bremgarten, Bern     
1931     500cc     Norton     Ulster Grand Prix     86.43mph
1932     500cc     Norton     Grand-Prix de L'U.M.F, Circuit of Rheims, France     
1932     500cc     Norton     Belgium Grand Prix     
1932     350cc     Norton     Swiss Grand Prix     
1932     500cc     Norton     Swiss Grand Prix     
1932     500cc     Norton     Ulster Grand Prix     85.15mph
1933     500cc     Norton     Swiss Grand Prix     
1933     500cc     Norton     Ulster Grand Prix     87.43mph
1935     500cc     Husqvarna     Swedish Grand Prix, Saxtorp     
1939     350cc     Velocette     Ulster Grand Prix     91.65mph
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