He was knighted in 1958 when the Lord Chancellor, Lord Kilmuir appointed him a High Court Judge of the Queen's Bench Division, a post he held until 1966. Davies's name almost immediately attracted public attention when it fell to him to try a German named Guenther Podola, who had shot and killed a police sergeant; Podola was convicted of capital murder and hanged in November 1959. In 1964 he was sent to Aylesbury to try the notorious Great Train Robbery case. The severity of the sentences he passed became and has remained controversial. Invested to the Privy Council in 1966, he was a Lord Justice of Appeal from 1966 to 1974. In 1967 he was appointed by the Secretary of State for Wales as chair of the Aberfan Disaster Tribunal. On 1 October 1974, he was appointed a Lord of Appeal in Ordinary and was raised to the Peerage as Baron Edmund-Davies, of Aberpennar in the County of Mid Glamorgan. To allow him to take this title, he changed his surname to "Edmund-Davies", so that his given name, which had formed part of his judicial title for more than 15 years, could be incorporated into his peerage. Following very severe problems with the recruitment and retention of police officers in England and Wales because of chronically low pay, which had by then fallen far behind the pay for comparable occupations, in August 1977 Edmund-Davies was appointed by Labour Home Secretary Merlyn Rees MP to chair a commission of inquiry into the negotiating machinery for police pay and conditions. His terms of reference were enlarged in December 1977 to include the levels of pay. His report was published in July 1978 and recommended a substantial increase in pay for police officers – of the order of 45 per cent. His recommendations were implemented in full in 1979 by the incoming Conservative Government, and the essential elements of the Edmund-Davies pay regime have remained undisturbed ever since. The Edmund-Davies review has become a cornerstone for police pay and the Police Federation of England and Wales – the representative body for police officers up to and including the rank of Chief Inspector – has tenaciously held onto the Edmund-Davies regime. In 1981, Edmund-Davies retired as a Law Lord. From 1974 to 1985, he was Pro-Chancellor of the University of Wales. Edmund-Davies was President of the London Welsh Trust, which runs the London Welsh Centre, from 1982 until 1988.
Family
In 1935, he married Eurwen Williams-James. They had three daughters.
Famous judgments
R v Collins 2 All ER 1105
Spartan Steel & Alloys Ltd v Martin & Co Ltd QB 27