He also represented Auckland and was part of victories over Australia in 1961 and Great Britain in 1962.
[2] He played two test matches for the New Zealand national rugby league team, including one as captain.
[4] Castle was a selector for the New Zealand national rugby league team between 1999 and 2001.
[5] Castle's wife Marlene is a four-time New Zealand Commonwealth Games lawn bowling representative.
[6] Their daughter Raelene is a sports administrator, formerly a chief executive officer of Netball New Zealand and the Canterbury-Bankstown Bulldogs[7] then of Rugby Australia since December 2017.