Montgomery Imperial Yeomanry officers?

[High Wood]

This photograph taken by a Newtown photographer possibly depicts three officers about to depart for the Boer War.

Newtown was once in Montgomery, but is now officially in Powys.

C Coy of the Montgomery Yeomanry were based in Newtown and members of the regiment served with the 9th Battalion Imperial Yeomanry in South Africa as the 31st and 39th Montgomeryshire Companies.

Despite there being no insignia, apart from officer's rank, visible, is it possible to identify these officers as being from the Montgomeryshire Yeomanry?