Hi,
Thank you both for your replies. In answer to you first Valda, yes I have obtained a copy his will. I only found it recently, and I am still working my way through it (I'm struggling with the hand writing). It was from that that I was able to deduce an approximate date of death. Thank you for taking the time to look for it.
In answer to your question Dawn, I'm hoping to find anything I can. I have marriage details for him in Newington, but nothing to give me any clues as to where he was born. The age you gave me from the burial record suggests he was born about 1763-4, and there is a 1764 baptism on the IGI in Stevenage which could well be him; but I'm not sure where to look next to prove it.
The church in question was demolished following a fire in the 1880's, so unless the vault was cleared before for some reason, I don't suppose there will be any other records then.
Thank you both for your help, and thanks again Dawn for finding the record for me.
Matthew