| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | RT | Temporary restricted area | | | CS | installed | | | / | | | 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 | 015 | 1500 feet QNE | | | / | | | Centre Latitude | 5152N | 51° 52' North' | | Centre Longitude | 00013W | 0° 13' West | | Radius of area affected | 002 | 2 nautical miles |
| | RESTRICTED AREA ( TEMPORARY ) INSTALLED FOR UAS ONLY ( KNEBWORTH,HERTFORDSHIRE ) WITHIN AREA BOUNDED BY 515302N 0001219W-515202N 0001154W-515213N 0001242W-515212N 0001249W-515209N 0001256W-515205N 0001258W-515159N 0001312W-515211N 0001331W-515216N 0001351W-515231N 0001345W-515302N 0001219W.DOES NOT APPLY TO ANY UAS FLYING IN ACCORDANCE WITH EXCEPTIONS STATED IN THE BRIEFING SHEET.BFS 072 / 2026,WITH CHART REFERS.FURTHER DETAILS WWW.NATS.AERO / AIS.RESTRICTION OF FLYING REGULATIONS MADE UNDER ARTICLE 239 OF AIR NAV ORDER 2016.AR-2026-3755 / 01. |
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