There could be more than an element of truth in that story. French prisoners [officers and NCO’s] were given parole under the care of an agent and lived in several towns and villages
throughout the UK called “parole towns”.
Records are held in National Archives, Kew for more details see http://www.nationalarchives.gov.uk/catalogue/RdLeaflet.asp?s...
> click on blue text ADM 103 [section 3], then under “arrangement” - Registers of parole prisoners click on ADM 103/549 and then select “browse from here” to see the extent of locations.
Records are not online and you will need to read the full details of the above leaflet to see in there is an index or if it will be a slog through each set to locate any Hubbard prisoners.
I saw something online for Okehampton and Oswestry a few years ago that I used to answer another query but I must have deleted the record of it. Try Google for French Parole prisoners or the like and try adding the names of towns you identify from the above, I’m sure find more information.