Orion class battleship HMS Conqueror.

I have seen this picture sometimes identified as HMS Orion but base the naming here on the Clyde-built database. The first British superdreadnoughts, the Orion class vessels represented an increase in gun size from 12" to 13.5", along with the abandonment of wing turrets for the main armament. From now on, the main armament would be mounted in the more efficient centre-line arrangement with superfiring turrets (although the Orion class still had a Q turret awkwardly placed between between the aft funnel and the aft superstructure).
Ship details: http://en.wikipedia.org/wiki/HMS_Conqueror_(1911)