 In 1934, he joined the British Union of Fascists (BUF), soon becoming director of the group's Shoreditch branch.At the 1937 London County Council election, he stood for the party in Limehouse, and the party then relocated him to Paddington.Wegg-Prosser became disillusioned with fascism, making contact with anti-fascist activists, and leaving the BUF at the end of 1937.