I agree with the comments that it more likely reads "C. E. Markby".
A good possibility would be the Rev. Cecil Edward Campbell Markby. He was recorded as "Clerk of Holy Orders" in Dorchester, Dorset on the 1939 Register, a short way from Salisbury (see RG 101/6918C, no 187):
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Local newspapers seem to confirm this is the right man. For example, in the _Bath Chronicle_ , 17 June 1933:
> Mr. C. E. C. Markby, B.A., Emmanuel College, Cambridge, who was ordained priest at Salisbury Cathedral on Sunday, is a son of the Rev. A. W. Markby, Vicar of St. Peter's, Dorchester, and formerly St. Saviour's, Bath...