Hi a-l
The Leicester Chronicle 26 April 1963 has a photograph of a Horace Whittle (no middle name), his age is 65 which fits with the DOB you have given.
The note with the photo reads:
"Mr. Horace Whittle (65) who was presented with an illuminated address yesterday by the directors of Fielding and Johnson, worsted spinners, of Abbey Mills, Ross Walk, for 50 years service on the firm."
What was your Horace's occupation? Do you have him on the 1939 Register?