I have no other information about this couple and your suggestion that perhaps they didn't marry after all is a possibility.
Albertina Lucretia was the daughter of James Reid, a linen draper, and Albertina Willmott, his wife who married in 1856 in Rotherhithe and had two children, Albertina and her sister Ellen May Beatrice.
I have only found census records for James and Albertina Reid up until 1861. James was running his linen drapery business from Oxford Street in central London. Albertina Lucretia was born in 1861. Ellen May Beatrice was born in 1863 in Bloomsbury, London and I have her baptism record which states the family were living in Robinson Place, Bloomsbury at this time.
James's wife Albertina had an unmarried sister, Ann Willmott who died in 1863 at the Rue de Rivoli in Paris.
The daughter Albertina Lucetia's marriage banns are published in Paris in 1895. Given all trace of the family vanished from the UK records from 1863 onwards I'm wondering if James could have moved his family and business across to France in the mid-1860s.
Do you know if there is there any way of checking trade directories to see if James Reid was trading as a linen draper in Etretat around the 1865-1890 timeframe?
I was expecting to find a probate trace on James Reid but there is nothing in the UK probate calendar. Do they have a similar probate index in France that I could lookup?