Herman Oscar Serck
1929 Herman Oscar Serck, the brother of Peter Oscar Serck, set up a business in Manchester to manufacture and service radiators - presumably H. O. Serck.
1932 Naturalised. 'Serck, Herman Oscar; Norway; Radiator Manufacturer; 261, Ryebank Road, Chorlton-cum-Hardy, Manchester. 5 May, 1932'[1]