Background
Coulthard was a son of George Robert Coulthard and Cicely Eva Minns.
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Coulthard was a son of George Robert Coulthard and Cicely Eva Minns.
He was educated at Watford Grammar School.
Coulthard was a pilot in the Royal Air Force from 1941-1946 with the rank of Flight-Lieutenant. After the war he was a 1st Officer with BOAC from 1946-1948 and a Pilot and Staff Officer in the Royal Air Force from 1948-1958. In 1959 he changed to a career in law.
He was Called to Bar by the Inner Temple and practised at Swansea from 1959-1981.
In 1970 he was made an Assistant Recorder and in 1972 he became a Recorder of the Crown Court. He served as Honorary Recorder of the Borough of Llanelli from 1975-1981.
He was Chairman of the Medical Appeals Tribunal for Wales from 1976-1981. In 1981 he became a Circuit Judge.
Coulthard was active in the Liberal Party as Chairman of Swansea Liberal Association.
He was Secretary of the Association of Liberal Lawyers. He was Liberal candidate for the Pembrokeshire division at the 1964 General Election. Although a Liberal had been elected there as recently as 1945, no Liberal candidate had stood in the two elections since 1951.
At that election, the Liberal came third with 19.9% of the poll.
Coulthard"s task was harder as there was now a Plaid Cymru candidate to compete for the nationalist note. He came in third with 19.1% of the poll.
He did not stand for parliament again. Electoral record
From 1960 Coulthard made British Broadcasting Corporation sound and television broadcasts.
He was President of the Swansea Festival Patrons’ Association from 1974-1980.