Mary REVLAND (married Michael Heaviside on 5 Aug 1754 in Heighington) Jane EARNGY (married Michael Heaviside - the son of Michael above - on 6 Mar 1788 in Newcastle)
Basically, I've not found any Co. Durham / Northumberland records for these surnames :-(
I've also brick-walled on James HEAVISIDE, who married Anne MARSHALL on 12 Nov 1719 in Heighington. On this, I think the family probably originated in Auckland St. Andrew / St. Helen (there are a load of them from 1590 onwards) but there is a gap from 1653 to 1700 in the online (IGI) records. If anyone has access to these, I'd be interested in any HEAVISIDES in there
Sorry Tony I misread your post as you have already searched the IGI
Sorry
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