Very intriguing that on his Marriage cert 23 July 1918 he signed himself off as being age 24 (born abt 1894), Clerk in Holy Orders, of Bassaleg House, Bassaleg and not just a one off..... in 1939 his DoB was recorded as 7 March '94.
He was baptised same day as his sister Beatrice Clara, on 21 April 1887, Pontlottyn, Glamorganshire. Parents John Allen, Fitter, and Sarah Ann
Cheers
AMBLY