He was the eldest of three sons of Wyndham Christopher Jones, the director of an electrical firm, and Lilias Rosalind Christina Johns.

[8][9] It was said that under "His Honour Judge Jones, [the court] actively encourages the co-operation of solicitors.

Barring those aged 10 or younger (whom Jones said are "irrebuttably presumed not to be capable of criminal intent") and between 10 and 14 years old (where "there is only a rebuttable presumption that they are not so capable"), he believed that children are innocent only through a lack of comprehension of the wickedness of their deeds.

Jones' diagnoses relied on the social contract theory, which he called "an aspect of the instinct for self-preservation."

Without the tacit arrangement of a social contract, humans would be uninhibited; with it, they recognise the mutual benefits of society and are inhibited by virtue.

A disinhibited person who once had inhibitions will also commit bad deeds; Jones resolved that they too are in need of treatment.

[12] Jones believed strongly in fair sentencing for criminals without mental health problems.