I was puzzled by that too John, I have now found one of those Sharp marriages in the marriage index
William SHARP otp, [Woolmonger Street], bachelor, full age, shoemaker, father Robert, labourer
Mary Ann LEACH otp, [Bridge Street], spinster, full age, father Edmund, labourer
1855 19-Mar Northampton All Saints
Julia married in 1855 also in the Wellingborough Registration district to the other William Sharp
There is a burial in All Saints, Northampton of Edmund LEECH of Woolmonger St age 46, 8 Nov 1854, I think this must be him