Okay my cert came in today- not bad getting on the 26th when I ordered it on the 22nd and it had to come across the pond!!
11 July 1870 Elsdon Heron,full age, widower, miner, married parish church of St. Nicholas, county of Newcastle on Tyne, son of Thomas Heron coal winder and Sarah Costello, full age, widow, father John Costello, Smith. Witnesses William Heron, Alice Heron. Elsdon made his mark and Sarah signed.
Looks like Sarah did not use her former married name when the marriage was registered.
Janis