Thank you, Trish and Suz. I had found the marriage in Rochford, but it seemed not necessarily the same Winifred K Talmage, since there were other possibilities. The further details you have unearthed all seem to make good sense and confirm this marriage.
There seem to be too many Sandford births around the country in the period to be reasonably sure of any except, perhaps, the 1923 male registered in Rochford.