There are no Peter Henry Harrisons born in Rotherham between 1880 and 1890.
The only Peter Harrison born between these dates in Rotherham was born Dec 1880.

Something doesn't ring quite right does it. I don't suppose his marriage cert is a misprint is it and should say 28 and not 23 (they can look alike)? Would it be worth asking the Register office to double check? I once asked them to look again as they had hubby's grandfather dying of an age related illness aged 17 (it should have read 77).