Royal Artillery - understanding the battery and unit shown in service record

[MarMnkly]

Hello please can you help
I have been lucky enough to receive a copy of a relatives record from the National Archives. I want to try to map his movement within the regiment and then work out where he would have been stationed. He was enlisted for home service only.  I think I am seeing information relating to both the battery and the unit, but I am not sure how to make sense of it?
For example, one line says in the unit column:
      41/15th LAA posted to 73/23rd LAA Regt.
Another line just says:
       /9AA Res Regiment
Another line says:
212/72 LAA Regt, etc.
Any advice gratefully received 
Mar

[crisane]

During World War II, "LAA regiment" (Light Anti-Aircraft Regiment) refers to a unit of the British Army's Royal Artillery (RA) responsible for air defense using light anti-aircraft guns.
This site may be able to help
https://ww2talk.com/index.php?threads/laa-regiment-batteries.45647/

[MarMnkly]

Thankyou crisane
I will post on that site
Regards
Mar