He became familiarly known as "T.J." He was Deputy Secretary to the Cabinet under four Prime Ministers:
David Lloyd George,
Bonar Law,
Stanley Baldwin and
Ramsay MacDonald. His 3-volume
Whitehall Diary (1969, 1971) threw much light on politics "behind the scenes", including the
Irish Treaty, the
1926 General Strike, the
Cliveden Set, and so on. When Baldwin became Prime Minister in 1923, he decided to retain Jones as Deputy Secretary, telling him on the day he was appointed Premier: "I shall want you to hold my hand, Tom". Baldwin appreciated Jones' value and they would remain friends for more than twenty years. Baldwin told Jones in 1929: I am a Tory P.M., surrounded with a Tory Cabinet, moving in Tory circles. You don't let me forget or ignore the whole range of ideas that normally I should never be brought up against if you were not in and out of this room. You supply the radium...you have such an extraordinary width of friendships in all classes, and so many interests that through you I do gather impressions of what is being thought by a number of significant people whose minds I should not know, at any rate so well, but for your help. I think every Tory P.M. ought to have someone like you about the place. A friend of many rich and influential people including
the Astors, Jones excelled at extracting money from rich people for worthwhile causes, notably adult education: he founded
Coleg Harlech in Gwynedd in 1927, was secretary, trustee and chairman of the
Pilgrim Trust from 1930, and was instrumental in the founding of
Newbattle Abbey College in Midlothian in 1937. His contacts were useful in other situations too: for example, it was he who introduced
Gareth Jones, subject of the 2019 film
Mr Jones, to Lloyd George. ==Later life==