It is only the initial search fee that is waived.
If a record is found payment will be requested before release.
Blackpool is standard signals recruit centre, however Cardington and South Ken suggest a deviation from a standard signals trained WOp on morse tape transmissions.
Morse Slip Readers were mostly WAAF in the UK so this part may refer to overseas service.
His record will show dates and, if you request informal review of mustering when you apply for a record, all the trades he was mustered in.
Currently time to produce an RAF record via the online system is 3 to 4 weeks.
Ross