I have not been able to find any baptism for Betty anywhere in England at the appropriate time nor a reliable one for Richard - I have checked all the baptisms in all the Abingdon churches to no avail.
In the Marriage records on FindMyPast Richard is described as a fisherman and both were from Kingston - no further info in where Kingston was. They appear to have been married by Special Licence as there is a record of a Sarum Marriage Licence Bond with the Bodnsman as William Austin, victualler of St Helen, Abingdon. As Richard was a fisherman I'm wondering if the Kingston referred to is Kingston upon Thames or is it Kingston Bagpuize?
Betty and Richard had eight children baptised at Marcham near Abingdon. The youngest has a second forename of Woodridge but whether this is a clue or not I don't know.
Interestingly their son John who had children baptised at Purley and Tilehurst in Berkshire was variously described as net maker and fishing net maker, an occupation probably picked up from his father.
I did find a Sarah Broadest marrying an Edward Pettifer (Pettefer) at Bampton, Oxforshire which isn't too far from Abingdon/Marcham and having six children baptised there. As the surname Broadest appears to be quite rare at the time in England and virtually non existent in the Oxfordshire and surrounding counties area I suspect that Betty and Sarah are related, possibly sisters, but haven't been able to find any baptism for Sarah.
I've posted here rather than on the Oxfordshire board as I've no idea where Betty or Richard were born.
Can anyone find anything I've missed please?