Johnstone played rugby from school age, selected for province side Natal at the age of 19. The tour managers choose to place the four wing players on rotation. Johnstone and
Saunders were chosen for the first game, against a combined South-Eastern Counties team at Bournemouth. Johnstone scored the first try of the tour in the 18th minute and doubled his score with another try in the second half. South Africa won 31–6. Johnstone next played in the third game against a joint
Pontypool/
Newbridge team (scoring another try), before being moved into the centre position in an encounter with
Llanelli. The very next game Johnstone was back in his favoured wing position and was back on the scoresheet with a try in a victory over the North-Western Counties. After being rested for the Glasgow/Edinburgh match, Johnstone played in two games back to back, wins over North-Eastern Counties and
Cambridge University. Johnstone missed the encounter against London Counties, the only South African loss of the tour, before scoring two tries in the eleventh game of the tour, against
Oxford University. On 24 November 1951, Johnstone was awarded his first international cap when he was selected to face
Scotland at Murrayfield. Scotland were beaten heavily, and although South Africa scored nine tries, none came from Johnstone or from the South Africans other wing
Buks Marais. His second cap came two weeks later when he was chosen for the match against
Ireland. The South Africans won 17–5, but again Johnstone was unable to secure his first international points. The game after Ireland, was a rough-and-tumble match against
Munster; As a result of this 'rough and tumble', Johnstone earned the nickname 'The Mauler of Munster". Johnstone was one of only six players from the Ireland encounter to be selected for the match, which was played in muddy conditions. Johnstone was criticised for some poor defensive work, with his tackling sometimes high and ineffective, but he started the scoring with a try late in the first half. The match was a tense affair, with little action for the
backs from either team. The game ended 6–3 to South Africa, and although Johnstone again failed to score at international level, he did make an important defensive contribution when he threw himself on the ball to prevent Wales'
Ken Jones from scoring. On 5 January 1952, Johnstone played in the game against England. He came close to scoring on two occasions, but was unable to finish either. Even without his tries, England were beaten 8–3. With the Home Nation internationals behind them, South Africa had five more matches before travelling to France. Johnstone played against
Newport and Midland Counties, scoring a try in the former, before he was selected for the last game in Britain, an encounter with
the Barbarians. On the day of the match, South Africa, through injuries, were without both fly-halves,
Dennis Fry and
Hannes Brewis. Johnstone was given the fly-half role despite having last played in that position over three years previously in an encounter between Natal and Transvaal. At half time, the Springboks were 3–0 down. Johnstone had not been poor at fly-half, but the play was not at its best. South Africa improved after the change, winning the game 17–3. Johnstone was given half of the kicking duties and scored a penalty, the last points of the match. Johnstone ended the British leg of the tour as he had started it, scoring the first and last points. The tour then travelled to France to play a further four games, including an encounter with the
France national team. Johnstone played in two, against South West France and the international. In the match against South West France, a 20–12 win, he scored a try and a conversion. Johnstone finished the match by converting a van Wyk try. South Africa finished the tour by beating France 25–3. On their return to South Africa, Johnstone received a letter from 'Danie' Craven, the tour leader and coach, stating that "You were the most improved player in the team".
1956 tour to Australia and New Zealand Two major tours came to South Africa before Johnstone represented South Africa again. He failed to play in the four Tests against the 1953 touring Australians and the four Test matches played against the 1955 touring
British Lions due to the fact that he was at that time studying law in Oxford. During his three years at Oxford, he was awarded a
Blue each year; and in 1954–55 he was captain of
Oxford University RFC. In 1956 the Springboks undertook a tour of Australia and New Zealand, and Johnstone was selected in the touring party. As well as the club and representative games, South Africa played six Tests, two against
Australia and four against the New Zealand '
All Blacks'. Johnstone played in the first Test against Australia, in his favoured position of right wing; South Africa won 9–0. He missed the second and final Test against Australia, but was back in the squad for the first Test against New Zealand on 14 July. South Africa were beaten 6–10, it was Johnstone's first loss at international level. Despite the loss, Johnstone was back for the second Test against the All Blacks, this time a win for South Africa. Johnstone was absent from the third New Zealand Test, in which the Springboks lost 17–10, and he was brought back for the final Test. South Africa lost the game, and the series against New Zealand, and Johnstone never represented South Africa at international level again. ==Notes==