| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | FP | Heliport | | | XX | miscellaneous plain language | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | N | For immediate attention of aircraft operators | | | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | A | Aerodrome information | | | E | En-Route information | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 025 | 2500 feet QNE | | | / | | | Centre Latitude | 5313N | 53° 13' North' | | Centre Longitude | 00409W | 4° 9' West | | Radius of area affected | 002 | 2 nautical miles |
| | BANGOR GWYNEDD GENERAL HOSPITAL HLS ( 531231N 0040926W ) CLOSED DUE WORK IN PROGRESS |
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