Hi,
Sandisondaughter ... I'll bite! You've obviously cracked "Wireless operator". "Lnr 18 A 55" may be a specialist trade skills code, relating to specific equipment?
1 W S ~ No. 1 Wireless School
The "3 DL and S.P." and "1 Sal Section" is really obscure, especially as it relates to the immediate post-War environment.
"Ruin Pk" may relate to a Park [ie dump!] for damaged equipment.
HE for Desk 2 ~ Home Establishment for [Personnel} Desk 2.
Over to the others! )