This is the annoying thing as He was in the Corp of Armourer's so I have trouble trying to pin him down.
The Record is not a good copy but the Researcher that did an overview when they obtained his papers annotated:-
Armourer Sargeant - assigned to the 1st Bat. Somerset Light Infantry 22/03/82 - 23/08/82
- Rejoined the Corps of Armourers 24/08/82 - 27/11/82
- assigned to the 2nd Bat. Royal Irish Regt.
It could well be he was on the way to the East Indies and was possibly recalled but I'm not sure because I think I read the Somerset Light Infantry were in Ireland. I know from the Regimental history the Royal Irish were in Egypt where the Armoury Sgt died which is a plausible reason why my ancestor joined them afterwards. His next posting on the entry is Egypt 28/11/82.
As I say, I'm just trying to work out where he was on the entry for Foreign Service "East Indies 18/01/82 ~ 27/11/82" its very confusing.