Notations on the side like 5A1/32 are Pay List Numbers, likewise, where there are notations like Vict {or Victory} 1-2A or 4-2 they are pay references.
The Trade or Occupation was to show his civilian employment before joining the Navy he is shown as Scholar, which means he joined the Navy straight from School at the age of 15. He then served three years training as an Apprentice.
He started as an Artificer Apprentice, then steadily progressed upwards, from Ordnance Artificer 5th Class [OA.5], to 1st Class [OA.1] and finally Chief Ordnance Artificer [COA]
Medals as he served through WW2, I would think he would have been entitled to the 1939-45 Star Atlantic Star - Africa Star War Medal 1939-45. He did have his Long Service and Good Conduct Medal as well [noted as LS & GM and Trace Medal 21.1.54]
The various shore establishments would have administered his pay etc
PEMBROKE 2 Chatham
DRAKE 2 Plymouth
EXCELLENT Portsmouth
BOSCAWEN Portland
ORLANDO Greenock
HANNIBAL Initially established at Algiers, then Taranto, Italy
ST ANGELO Malta
VICTORY III Portsmouth
VERNON Portsmouth
OSPREY Portland
SEA EAGLE Londonderry
CALEDONIA Rosyth
For the ships he served on
GEORGETOWN = destroyer, ex-USS Maddox, transferred under Lend-Lease.
(H.C.) sorry, I cannot explain this one !
LAUDERDALE - Hunt class Escort destroyer
ROTHERHAM = R class Destroyer
LIVERPOOL = Town class light Cruiser
DUKE of YORK = Battleship
DIDO = Dido class light Cruiser
JAMAICA = Colony class light Cruiser
CRISPIN = C class destroyer
BELLEROPHON = Reserve ships, Portsmouth
KENYA = Colony class light Cruiser
ZEST = Z class destroyer
BRIGHTON = Type 12 frigate
YARMOUTH = Type 12 frigate
He was evidently discharged from the RN in 1966