This photograph was in the Church Family archives with a caption of 'Northants Regiment taken at rear of Queen Street, in Eastfields Grounds.'

Charles Church is in the back row, a sargent, 6^th. from the left. 

Also in the archive with Charles Church named on the back.
He is in the front row, right of the officer, and appears to have
lost a lot of weight and his moustache is less bushy.