Deciphering military records (poor quality)

I have been waiting since February for the Army Records to send me my Dad's service record - due to Coronavirus delays. I was going to wait for those before asking for help on anything I didn't understand but I came across some poorly defined documents in my fathers records which I have posted below.

They are so hard to read due to the quality but I thought there may be members that might recognise acronyms, entries or references which might help me pin down more details about where he was during the period from 1944 - 47 and what he was doing. Before that date he was in a reserved profession and having read the work that was required during the Birmingham Blitz I can see why - I do recall him being frustrated about not being able to sign up earlier.

The documents are too large to upload so here is a link to my shared drive containing scans of the originals.
Service Records - Google Drive

I also thought some might be interested in the document about the work of the GPO during WW2 which was published in 1946.
http://cloudobservers.co.uk/wp-content/uploads/downloads/2015/05/The-Post-Office-Went-to-War.pdf

Any help would be most welcome. Thanks
Dave
I have posted this in the Signals Section so hopefully I'm not breaking any rules.

 

Best not to have more than one post as we are easily confused and it will get us running around in circles!
What does these documents tell you about My Father?