Born in Swansea, Griffiths earned a scholarship to the University of Oxford with the highest entry results in Wales.
"[1] After leaving the military he edited a personnel magazine for Business Publications London, where he met his future wife, who was Australian.
[3] From 1975 to 1980 Griffiths was a script editor with the Australian Broadcasting Commission and received AWGIE Awards for episodes of Frank Hardy's Power Without Glory and Truckies.
Griffith also co-wrote Becca (1988), an Australian-Welsh television co-production of an 1840s Welshman transported to Australia, as well as writing the teleplay to Outbreak of Love from the novel by Martin Boyd.
In addition to writing, Griffiths interviewed many survivors of RAF Bomber Command for the 1987 ABC documentary Wings of the Storm and donated all his footage to the Australian War Memorial.