Sorry, I don't have any information regarding Northamptonshire records. I found the marriage entry using FreeBMD which only gives the Registration District. The marriage entry does not appear on FreeREG under Northamptonshire, but there are a number of baptisms at St Peter, Walgrave.
Fred = baptised 28 May 1882 son of Joseph and Hilda Jacquest of Walgrave. Joseph is a Shoemaker.
Walgrave records on FreeREG are quite extensive, but are transcriptions, so you may find further information by looking at the parish registers themselves.