Their four children can be found on
http://www.freebmd.org.uk/ One born in Chorlton the other three Dudley, all with mother's maiden name Wylde.
There is also a death for a John WA Hall in 1968 Northampton.....possible?
(Ruby's girl, I think this should be moved to Lookup Requests, perhaps one of the moderators will do this for you?)
Added: the death in 1968 may not be correct as there is a John WA(Andrew) Hall born 1895 in Norfolk died 1968 Northampton according to an online tree.