In England, what year was the drop-eared variety officially designated as the separate Norfolk Terrier breed?

Answer

1964

The drop-eared variety was officially designated as the Norfolk Terrier in England in 1964, following a campaign by Miss Marion Sheila Scott McFie to have the two ear types recognized as distinct entities.

In England, what year was the drop-eared variety officially designated as the separate Norfolk Terrier breed?
HistoryDogbreedTerrierNorwich