Websites often seem to get mixed up about exactly what data they are presenting, or give it misleading titles. In the case of a marriage, there might be three separate items: parish register, bishop's transcript, and a licence.
In this case, everything you need is at FindMyPast. The marriage was at Edlington on 15 January 1770, and it appears in both the parish register and the bishop's transcript, though the BT appears not to have been indexed, and I only found it by browsing.
Both PR and BT indicate that John Hey was of Thornhill and Sarah England of Edlington (neither mentions "Nerbon"), and that the marriage took place by licence. The licence is what FamilySearch have presented as a marriage, and you can check this by looking in their catalogue for the film number given in the record (1469749). This also explains the date discrepancy - the licence was issued on 14 Jan, and the marriage took place the next day.
There's another index to licences at FindMyPast, but this doesn't mention "Nerbon". So unless someone recognises it as a place in Thornhill, you'll really need to look at the licence to work out if this is what it really says, or if it's a mistranscription. You can order a copy from the Borthwick Institute in York. (Strictly speaking what you get with a marriage licence record is the bond and allegation, which were the associated documents - very few actual licences survive.)