[citation needed] Prohm played left-centre and scored 2-tries in Hull Kingston Rovers' 14–15 defeat by Castleford in the 1984 Challenge Cup Final during the 1984–85 season at Wembley Stadium, London, on Saturday 3 May 1986, in front of a crowd of 82,134.
in the 1984–85 John Player Special Trophy Final during the 1984–85 season at Boothferry Park, Kingston upon Hull on Saturday 26 January 1985.
Prohm played left-centre and scored a try in Hull Kingston Rovers' 18-10 victory over Castleford Tigers in the Final of the 1983-84 Rugby League Premiership during the 1983–84 season.
Prohm played left-centre, in the 22–18 victory over Castleford in the 1985–86 Yorkshire Cup Final during the 1985–86 season at Headingley, Leeds, on Sunday 27 October 1985.
[citation needed] Prohm played left-wing in Hull Kingston Rovers' 8-6 victory over Queensland as they toured Papua New Guinea and England part of the 1983–84 Rugby Football League season.