Thank you all for the information you have provided, it has been really interesting and helpful. I did come up to Hexham a few years ago to look for the gravestone but could not find it; clearly, I was not looking in the right place! Interestingly I actually found a section of Matthew’s will in J. C. Hodgson’s A History of Northumberland (1902) Vol VI which calls him a gentleman with lands in Slaley, Hexham and Hexham East Common as well as a farm in Acomb. He also gave money to protestant dissenters in Giligate, so why he was buried in an Anglican church seems to be my new mystery!