| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | WU | Unmanned flight | | | LW | will take place | | | / | | | Traffic | I | IFR traffic affected | | | V | VFR traffic affected | | | / | | | Purpose | B | For inclusion in Preflight Infomation Bulletins | | | O | Operationally significant for IFR flights | | | / | | | Scope | A | Aerodrome information | | | W | Navigational Warning | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 010 | 1000 feet QNE | | | / | | | Centre Latitude | 5148N | 51° 48' North' | | Centre Longitude | 00034W | 0° 34' West | | Radius of area affected | 001 | 1 nautical miles |
| | UAS SWARM OPERATING WITHIN 0.3NM RADIUS OF 514754N 0003331W ( BERKHAMSTED ). SWARM MADE UP OF 500 UAS.MAXIMUM HEIGHT 400FT ABOVE GROUND LEVEL.FOR INFO 07500 873866 / 07980 741970.AR-2026-6466 / 01. |
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