Warrington was called to the Bar, Lincoln's Inn, in 1875, and after acquiring a large practice, became a Queen's Counsel in 1895.

[1] In 1904 he was appointed a judge of the Chancery Division of the High Court of Justice and knighted.

On his retirement in 1926 he was elevated to the peerage as Baron Warrington of Clyffe, of Market Lavington in the County of Wiltshire.

Lord Warrington of Clyffe died in October 1937, aged 86, when the barony became extinct.

It is so unreasonable that it might almost be described as being done in bad faith ... [No] public body can be regarded as having statutory authority to act in bad faith or from corrupt motives, and any action purporting to be that of the body, but proved to be committed in bad faith or from corrupt motives, would certainly be held to be inoperative.