Gentlemen
Mystery solved
The photo is of : P C Henry Ulric Rose b 1906 Nottingham (living in 1911 Beckenham / Bromley, Kent)
Appointed 22 Oct 1928 - Warrant No. 117918 - J Division Bethnal Green
http://www.flickr.co...57619598686347/ (photo record of joining date)
It has been suggested the Helmet is a 'Met Police Night Helmet' ?
Another suggestion was that he may have been Ministry of Defence Police, in that period it was probally a sub division of the Met. ?
Thanks again
Rob