FFF - Here they are:-
AGA - Aerodromes, Air Routes & Ground Aids
COM - Communications
RAC - Roles of the Air and Air Traffic Services
NAVW - Navigation Warnings
OTH - Other
Useful page for understanding the acronyms and abbreviations is
http://www.ais.org.uk/aes/pubs/aip/pdf/gen/10202.PDF Takes a short time to download so don't give up.
The education issue is one that we, AIS, and the CAA recognise. You should see more information being put out through various media in the coming months. In the meantime if your airfield is one that doesn't put the FIR brief up, please ask them to. Today's EGTT brief runs 14 pages at the default settings on Internet Explorer, reduces to 12 if you use View/Text Size to reduce the font and will go even smaller if you reduce the margins.
Mike