I wonder if it's the same person - from the London Gazette list of of 18 March 1949
Weiss, Wilhelm; Austria; Medical Practitioner; 69, Embassy House, West End Lane, London, N.W.6. 9 February, 1949.
There's a Wilhelm Weiss, practitioner, b 11 Nov 1904 in Manchester on the 1939 register
This is our man's naturalization - again from the Gazette
Whiteley, William Francis (formerly Wilhelm Franz Weiss); Austria; Lawyer; 31, Fitzjohns Avenue, London, N.W.3. 1 July, 1946