He was British Correspondence Champion in 1972 and awarded the IMC title in 1981.
According to Kings Indian I Attacking Systems :
“British Correspondence Champions 1971/72. Placed second in an ICCF master tourney 1973/76. A member of the British team in the 9th Olympiad 1977/80. Gained the IMC title in the European Team Championship 1978/81.”
According to Chessbase Correspondence Database 2020 Frank achieved his highest (ICCF) rating in January 1991 of 2410.
As White Frank would play the Queen’s Gambit via a 1.Nf3 move order. He did not play 1.e4
As the second player he would defend the closed Ruy Lopez and the Nimzo-Indian Defence.