Hugh Ross-Williamson was an Anglican clergyman who converted. He had been brought up in a non-conformist (Presbyterian) family, had become a High Anglican, and was finally received inti the Catholic Church when the Anglicans recognised the orders of group of Methodist clergy in India in 1955.
He wrote a book about the Roman Canon, 'The Great Prayer', as well as plays, history, and journalism; he was on the 'Brains Trust' TV programme until his conversion. (His complaint 'This is 1955, not 1555!' fell on deaf ears: a Catholic was not acceptable on the programme.)
Williamson was very disturbed by the theology of the New Mass and later wrote a pamphlet arguing that it was invalid. He saw a strong parallel with the liturgical changes made by Cranmer in the course of the English Reformation.
Arnold Lunn was a great apologist, as well the inventor of slalom ski racing; as an agnostic he had a debate with Monsignor Ronald Knox which was turned into a book, 'Difficulties', and although many thought he'd done rather well in the debate, two years later he became a Catholic.
Even as an agnostic he had been a fierce opponent of scientific materialism, and was very interested in the roots of the decline in religious belief. He researched the way religion was being taught in the great Anglican public schools and published a book, 'Public School Religion', about it.
Basically it wasn’t being taught at all because the chaplains in those places no longer had any confidence in their religion – this was in the 1930s. The great contrast, he discovered, was with the Catholic schools, where it was still being taken very seriously. He could see where things were going; like many in the early 20th Century the Catholic Church looked like the last bastion of reason and civilisation, let alone religion. And then the Catholic Church started to incorporate many of the same ideas and reforms which had hollowed out the Anglicans.
The attitude of these three was not unusual: one of the great early successes of the LMS was organising a petition to ask Pope Paul V that the Traditional Mass be preserved. This led to the ‘English Indult’ of 1971. The petitioners were all intellectual and cultural figures, mostly non-Catholic; the included Yehudi Menuhin, Agatha Christi, Grwham Greene and Sir Colin Davis. You can see more about that here:
http://www.lmschairman.org/2012/09/fiuv-position-paper-on-western-culture.html
http://www.lmschairman.org/2013/06/the-early-years-of-traditionalism.html
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