Hello again Mel
Following on from William's parents, John & Catherine, I have had a look and reckon that, if John was local to the area, he could only be either John born in Northbourne (nearby village to Worth) to Daniel & Elizabeth (nee Kemp) on 17 July 1727 or John born 6 Jan 1733 to John & Mary, also in Northbourne. I know it's a bit vague and there's no way of being certain - it could even be a totally different branch of the family. There were a lot of Newings in Thanet and Whistable.
Regards
AJ