Thanks all for the help so far. As I said I am truly just learning.
His name was Bartholomew Harrison. I have 2 lots of papers for him the first which states him as serving in the Durham Militia overall for 23 years 6 mths upto the 1st May 1802 and Sergent for the last 4 years and 9 mths of that. His age at this point is stated at 47 (Ref WO 121/63). Then the second Document, obviously his dishcharge papers, that states him as being discharged from 7th Aug 1809 in Gibraltar and also it states that he was in the Prince of Wales Dragoons from 6th May 1790 - 25th sept 1802then out on Pension for 3 mths before rejoining 1st Royal Veteran Battalion on 25th Dec 1802 till his discharge date. Age at discharge state as 54 (Ref WO 97/1140B).
After reading closer, as some of it is very hard to read, I noticed it say that his discharge was due to "Asthma and General Debility".
Does this information help any further.
Kind regards
Brian