Hi Dave
His record, which would have included his attestation and discharge forms, does not appear to have been kept. This usually means he was not awarded a pension. Lots of men were recruited for limited service, ie seven years, in this period. You will need to research the muster books in the National Archives starting with 1815, then working forwards until he is discharged, dies or is transferred to another regiment. His last entry may give his place of birth. It not, you have to work backwards until he is recruited. His first and last entries give a reasonable chance of giving his place of birth, age etc. failing that it should say where he was enlisted.
Next best is to research if he was conscripted into the Worcestershire Militia, starting by contacting the local Record Office who may have details of the lists draw up and the men selected. The musters for the Militia are in Kew under Worcester
Ken
