For more than 30 years I'd been looking for a Vause marriage, and I think I've found it. It's been staring me in the face for the last couple of years, when someone sent me an index of Vause births, marriages and deaths from Lincolnshire in England.
My great great grandfather Richard Vause (1822-1886), who came to South Africa in 1852, was the son of John Vause (1784-1863) and Eleanor Wyatt. John Vause was himself the son of John Vause (1747-1823) and Elizabeth, whose maiden name we did not know. The elder John Vause was the son of Richard Vause (1720-1751) and Elizabeth Hill, who remarried Francis Whitehead in 1756.
I was checking the index again, to see if there were any matches to things I had found in the Crowle church registers and censuses, and there it was, staring me in the face: John Vause married Elizabeth Brooks in Epworth on 7 January 1780
I'm pretty sure this is the right one, because they had four children born to them in the 1780s, Richard, John, Samuel and Sarah. Samuel and Sarah died young (and Elizabeth died shortly before Sarah, possibly as a result of complications following childbirth).
Richard married a Fanny, and apparently lived in Hull, and it seems that his nephew and namesake lived with his aunt in Hull before marrying Matilda Park in Bath and emigrating to Natal.
Anywway, the next step is to discover Elizabeth Brooks's parents. Another one whose parents are still unknown is Elizabeth Hill, but she is said to have been the sister of a John Hill, Gent., of Hull. A Mary Vause married a John Hill in 1770, and this Mary was probably a niece of the Richard Vause who married Elizabeth Hill, so the Vause-Hill connection needs to be followed up.