If you have a rough idea of where they were living after they married you could try searching Electoral Registers, some online or visit the Archives/Library that covers the area.
You could try searching the GRO Index for any children born to them, mother's maiden name is given on it for this period.
If they are deceased you could look for a death registration on the GRO Index and then a Cemetery or Churchyard burial. Also might be a death notice in a local newspaper.
Again if they are deceased their record might be open on the 1939 Register on Findmypast. This can be accessed in any Devon RO and many Devon Libraries free of charge. Also some recent Electoral Registers available on Findmypast.