While there are a number of records of one sort or another for Ralph or R or R with another initial, none so far have the detail that identifies them to a place or person.
Did he have another initial? Is the photo really devoid of clues, for example is he wearing breeches or trousers, has he a bandolier across his chest (leather ammo pouches on a belt).
Which sleeve is the stripe and is it a chevron ((V shape) point up or down?
Wife's name if married.
There is a Ralph Whitehead on the absent voters list for Stalybridge and Hyde in Minton Street???
None of the above may help but always worth looking for clues.
MaxD