Scoular signed for Portsmouth in 1945 from Gosport Borough as part of the post-war rebuilding undertaken by manager Jack Tinn. He quickly established himself in the first team, forming a Wing half partnership with England internationalJimmy Dickinson, impressing many with his tireless stamina and tough tackling, which lead Duncan Edwards to state that Scoular was "the finest tackler of the ball I ever saw" After helping the club to consecutive league titles in 1948–49 and 1949–50, Scoular's relationship with the club became strained and he left to sign for Newcastle United for a fee of £26,000 in 1953. Handed the captaincy on his arrival, he made his debut for Newcastle against arch-rivals Sunderland in a Tyne–Wear derby on 22 August 1953. Two years later, Scoular captained Newcastle to victory in the 1955 FA Cup Final as they beat Manchester City 3–1. He stayed at the club until 1960 when Bradford Park Avenue paid £1,500 for his services, appointing him as player-manager at the age of 35. In his first full year at the club he steered them to promotion into Division Three but was unable to keep the club up and they were relegated back into Division Four in the 1962–63 season. In February 1964, Scoular retired from playing and was sacked as manager at Bradford Park Avenue four months later.
International
Scoular made his debut for Scotland on 12 May 1951 in 3–1 win over Denmark. He went on to win a further eight caps over the following year, winning his final cap on 5 November 1952 in a 1–1 draw with Northern Ireland.
Managerial career
One month after his departure from Bradford, Scoular was appointed manager of Second Division side Cardiff City. His spell with the club started badly, failing to win any of his first twelve games in domestic competitions. His first win in charge of the club came on 13 October 1964 with a 1–0 victory over Danish side Esbjerg fB in the European Cup Winners' Cup. With the Welsh Cup winners awarded a place in the European Cup Winners' Cup, Cardiff became regular entrants into the competition, winning the Welsh Cup seven times in Scoular's nine years as manager. Having reached the quarter-finals in his first year, eventually being eliminated by Spanish side Real Zaragoza, three years later they went one step further, reaching the semi-finals before losing 4–3 on aggregate to Hamburg. To date, it remains the furthest any Welsh side has progressed in a European competition. After almost achieving promotion in the 1970–71 season, the club's results slowly deteriorated, culminating in a 20th-place finish in 1972–73. With the team still struggling at the start of the following season, Scoular was sacked. He later managed Newport County until 1977 and also worked as a scout for Aston Villa, Wolverhampton Wanderers, Swansea City and Newcastle United.
Managerial statistics
After retirement
Scoular later worked as a representative for a chemical firm before running a guest house in Cardiff. He died on 19 March 1998, aged 73.