The year 2014 marks the centenary of the start of the First World War.

Here is a selection of pictures that are part of a previously unpublished set of World War One (WW1) images from a private collection.

The pictures offer an unusual view of varied and contrasting aspects of the conflict, from high tech artillery to mobile pigeon lofts, and from officers partying in their headquarters to the grim reality of life and death in the trenches.