Commissioned Gunner RN

[badjez]

Just a little confused by an entry found in an old copy of a wartime magazine.
It records the passing, in Immington [Immingham, Lincs] of an ex-colleague, 'Lt EG Haycraft RN (Collector)'.

I have scanned his photo, which looks very much like khaki OSD with a RN cap badge, and medals, presumably Gt War.

The Commonwealth War Graves Commission lists Ernest George Haycraft, 59 years, Commissioned Gunner, as having dies on 31.08.41. and buried in Immingham.

Naval-History.net lists amongst casualties on 31.08.41.
'Beaver II, cycling accident :*HAYCRAFT, Ernest G, Commissioned Gunner (T), died'.

HMS Beaver II was part of 24th Mine Laying Flotilla, based at Immingham.

So what is a 'RN (Collector)', and why is a 'Commissioned Gunner' serving in the navy, wearing OSD aged 59?

Stephen.