Haydon was elected in 1966 to the Nepean Township council, after it was expanded to five aldermen from three. In 1969, he was elected reeve of Nepean. He defeated the incumbent reeve
D. Aubrey Moodie in a landslide with 66% of the vote, thanks in part to voters in the urban parts of the township being unhappy with a tax increase attributed to Moodie. The
Nepean Sportsplex and
National Capital Equestrian Park were built during Haydon's term as reeve. Originally thought of as a
Liberal, Haydon ran for the
Progressive Conservative Party of Canada nomination in the riding of
Ottawa West in April 1978, ahead of the
1979 Canadian federal election. Haydon lost the nomination on the first ballot, losing 771 votes to 593 against
Ken Binks, who went on to win the seat. Following the
1978 municipal elections, Haydon ran for the position of regional chair of Ottawa-Carleton, defeating
Rideau Township reeve
Bill Tupper in a 17–13 vote of regional councillors. Haydon would go on to serve as chair for 13 years, helping to introduce Ottawa's
Transitway,
Ottawa City Hall (then the Regional Offices), and the
Robert O. Pickard Environmental Centre. He failed however in his plans to establish a second
Greenbelt in the city as well as his dreams of establishing Ottawa as a federal capital district. After retiring from politics, he ran a bed and breakfast with his wife. ==Attempted comeback in politics==