In 1953, John Watts formed and led the Grenada National Party as a rival party to Eric Gairy's Grenada United Labour Party started two years earlier — a party that would become its main rival for the next 25 years. In an early GNP manifesto Watts declared that the party was "democratic socialist", but disavowed trade union connections and shaped the party to have a multi-class appeal — a philosophy inherited by Blaize when he became leader two years later. The first General election with several political parties was held in 1957. 1960 saw the GNP in a coalition with another political party and the following year it lost the election. However Gairy was soon banned from political activities, losing his seat, and the Constitution was suspended by Britain. The GNP then won the 1962 elections, on an unfulfilled promise of a "unitary state" with Trinidad and Tobago, and Blaize remained chief minister until the party lost the elections to Gairy in August 1967.
Rotary
In 1974, Sir John became the first Rotary District Governor for District 404 which includes all the French, Dutch, and English speaking islands in the Caribbean. He was later appointed member of the 1976 Convention Committee of Rotary International and helped the charter of the Rotaract Club of Grenada.
President of the Senate
Whilst he was vice chairman of the New National Party and head of the Grenada tourist board, Dr. Watts was first appointed a senator on 27 April 1998. He was president from 1988 to 1990 and secondly from 1995 to 2004. In June 2004, he was appointed a consultant to parliament as a senior figure in the then-ruling party.
Recognition
On 31 December 1999, he was awarded the Order of St Michael and St George. He was praised in December 2012 by the Grenada Hotel and Tourism Association, as part of its 50th anniversary celebrations sponsored by Spice IslandBeach Resort to honour him as the main stimulus behind the formation of the association in 1961. Dr Keith Mitchell mentioned his own successful bid for leadership of the party in 1989, noting that Sir John, unlike many of his peers, was the one person who stated, “let democracy prevail” when he wrested leadership from Mr Blaize, which led to formation of the New National Party. A year later, at the Independence Day Awards, he was among four people rewarded for their contribution to the growth of the nation.
Death
He died on 11 May 2015 near St. George's, Grenada.