In 1968 he set a club record of 30 points for Newport against Penarth, and was selected for the 1968 British Lions tour to South Africa. Jarrett played for Wales at rugby union ten times in all, making his final appearance against Australia on 21 June 1969 during the Wales tour of New Zealand and Australia. On his return from tour in 1969, Jarrett joined rugby league club Barrow for a signing-on fee of £14,000 (based on increases in average earnings, this would be approximately £383,500 in 2016). He was also selected for the Welsh national rugby league side, before he had played his first match for Barrow. He was later transferred to Wigan, although he did not play from them. Jarrett's rugby career was cut short in 1973, aged just 25, when he suffered a stroke resulting from a haemorrhage.