Hi J D
I've spent a while looking for Francis Dunn c1900 and have come up with an army pension record for Frank Dunn born 5th September 1900 in Collyhurst. Frank Dunn apparently joined the Corps of Signals in 1920, stating he was single, however the next of kin is "step father George Taylor address 175 Cheltenham St Collyhurst " Another coincidence! Could this be Francis?
Frank's address on leaving the corps is 23 Crissy St Queens St Manchester.
Sorry if you have already found and discounted this gentleman but when I saw the address of Bernard's father it seemed worth mentioning.
LS2