as I've discovered, a bit of caution is needed as his father had the same name, minus the George. I have found two London electoral register records for EGH Armitage (using full name) for 1936 & 1937 in the Catholic Presbytery in Hendon.
There are also a series of telephone book entries for EGH Armitage (using intials) from 1958 to
title rev and address Presbytery, St Raphael's Colony, Barvin Park, Potters Bar
a warning - there are a couple of rather speculative trees on Ancestry which suggest heemigrated in the US in 1924, married and died there in 1961!