No, definitely British/British Empire. Note on his cross belt there is a starred badge with a Victorian crown on it. Saying that, acknowledging the comment about it possibly being Irish, I think it might also be non-UK uniform, i.e. Australia, New Zealand etc. On the spurs, as a 'field officer' equivalent (although the crown and pip have not always indicated a Lieutenant-Colonel or equivalent) he would be 'mounted' and so wear spurs.
To the original poster, definitely try the Armed Forces board for more informed comment.
Regards.
Simon