Back in Britain in 1934, he met Peggy Williams from the Oxford Group, later known as the Moral Re-Armament, a Christian movement founded at Oxford in the 1920s.
Crothers' play was reportedly inspired by a real-life religious movement of the day, Dr. Frank Buchman's Oxford Group of the 1930s.
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Begbie had a strong religious bent: he was involved in the Oxford Group (which later became Moral Re-Armament) and with the Salvation Army.
He was introduced to the Oxford Group in 1934, the Christian movement that was the forerunner of Moral Re-Armament(MRA) and Initiatives of Change (IofC).
On the 1931–32 Springbok tour of the UK and Ireland, he came into contact with Frank Buchman's Oxford Group and decided to give up rugby to be a part of the Moral Re-Armament, although he still coached on occasion.
From 1930 till 1939, Weatherhead was a member of Dr Frank Buchman's Oxford Group and wrote several books reflecting the group's values, including Discipleship and The Will of God.