The names of the children might be a clue. Craig Stringer gives them as Gould and Eileen. Gould is a very unusual name, and I'm not even sure whether it was given to a boy or a girl. The only Gould Leonard I could locate in any kind of UK records (even with alternative spellings) was an entry in the London phone directory from the 1930s to the '70s, which might well be the same person. It's interesting, however, that there are a few Gould (or Gold) Leonards, some male, some female, scattered around the US and Canadian census records for the nineteenth century, which suggests we might be looking on the wrong side of the Pond.