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I have a list of Huntingdonshire marriage bonds and allegations [which used to be online, but I can no longer find it]. 
Susan Wright and Francis Turner (both of St Neots) were married by licence in 1704. Although Ancestry has St Neots registers, the 1704 pages seem to be in a bad condition, and there are no marriages indexed.
Cambridgeshire Archives should be able to supply a copy of the bond - I'm not sure of their current prices, but if you email your request, I have always found them very helpful.

There is also a bond for a marriage of a Francis Turner and Elizabeth Triston (both of St Neots) in 1715, but in this case the marriage doesn't seem to be in the St Neots register, although the page for 1715 is clear.

A Francis Turner, baker was buried at St Neots on 14 October 1732.

Have you tried local newspapers for a report of the divorce?  By the '60s, a divorce would have become less newsworthy than in earlier times, but that would depend on the circumstances.

Also, before the Divorce Reform act of 1969, (which came into force 1 January 1971), only the 'innocent' party could petition for divorce, so if either of the couple you are looking at had a spouse who didn't wish to cooperate (for a while at any rate), they might have gone to live together elsewhere before they were free to marry. 

If electoral registers and telephone directories are available for the relevant areas you might be able to tell how long they were still at the address where they lived with their first spouses, and when they start appearing in the place where they married.

Not especially helpful, but in 1881 on the same page as some of their neighbours in 1891: Peter and Ellen Forster; Josiah and Elizabeth Birchall; Joseph and Margaret Boyers and James and Elizabeth Broadbent, there are three properties recorded as 'uninhabited'. 

I think that the 'U' written there only means that the house was empty on census night, so possibly one of the three was the Ashcroft house, but the family were away for some reason.

Do you know of any relatives they might have been with? Or perhaps they were travelling, and not recorded at all.

Thanks Comberton .  Didn't see what they'd done with it.

After the Married Women's Property Act was passed in 1882, a married woman had a right to her own property, so whatever your relative possessed when she died in 1935 absolutely belonged to her, and was not automatically her husband's, either before or after she died.

She may have accumulated savings, inherited from another family member or worked at a job  that wasn't a full time occupation. (After she married, census records state that my grandmother's occupation was "home duties".  I know for a fact that she earned money from sewing.)