You might like to download the battalion war diary here for £3.50 iscovery.nationalarchives.gov.uk/details/r/C7354160. The November 1918 to March 1919 diary may well have entries relating to the gradual demob of men and, if you are lucky, may mention your man or at least the re-enlistment.
MaxD
Had a quick look, he diary says where they were during Dec 18 to May 1919 but nothing about the demob/move of soldiers at all.