Son of James G. Lloyd of Kilgerran, Pembrokeshire, Lloyd studied at Sloane School and Selwyn College, Cambridge, before taking a teaching post at Bembridge School on the Isle of Wight, where he involved himself in the trusteeship of various organisations relating to John Ruskin. He became a barrister at Gray's Inn in 1939, specialising in patent law, then became a Queen's Counsel in 1961. During the Second World War he served as a government scientific researcher.
Lloyd was made a Justice of the Peace for the county of Surrey (where by 1983 he lived at Esher) in 1953 and also appointed a Companion of the Order of the British Empire (CBE) in the 1953 Coronation Honours.
Lloyd stood unsuccessfully for the Liberal Party in Anglesey at the 1959 general election, becoming President of the Welsh Liberal Party from 1971 to 1974, and of the British Liberal Party in 1973–74. On 29 June 1973, he was created a life peer as Baron Lloyd of Kilgerran, of Llanwenog in the County of Cardigan, and in the Lords, he focussed on developments in patent and copyright law. From 1977 to 1983, he was joint treasurer of the party, with Monroe Palmer.
He married in 1940 Phyllis, daughter of Ronald Shepherd of Chilworth, Southampton, Hampshire, with whom he had two daughters. Lord Lloyd died aged 83 in 1991. She outlived him, dying on 11 September 2006 aged 99.
- Debrett's Handbook, 1982; Distinguished People in British Life. Debrett's Peerage Ltd. p. 950. ISBN 0-905649-38-9.
- Tim Hilton, "Patent law and Liberalism in Ruskin's plaid", The Guardian, 4 February 1991
- "No. 39863". The London Gazette (Supplement). 1 June 1953. p. 2955.
- "No. 46021". The London Gazette. 3 July 1973. p. 7761.
-  Peerage News BlogSpot post by Michael Rhodes.
|Party political offices|
| President of the Welsh Liberal Party
| President of the Liberal Party
| Treasurer of the Liberal Party
1977 – 1983
With: Monroe Palmer
Wynn Normington Hugh-Jones