| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | FH | Helicopter alighting area/platform | | | LC | closed | | | / | | | 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 | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 999 | Unlimited | | | / | | | Centre Latitude | 5145N | 51° 45' North' | | Centre Longitude | 00135W | 1° 35' West | | Radius of area affected | 005 | 5 nautical miles |
| | JOINT AIR DELIVERY TEST AND EVALUATION UNIT ( JADTEU ) HEL LANDING SITE ( HLS ) NO LONGER AVAILABLE.ROUTINE HEL MOVEMENTS WILL CONTINUE TO UTILISE RUNWAY,ALL TEMP HLS WILL REMAIN INACTIVE WHEN NOT UTILISED BY JADTEU FOR PRE-ARRANGED ACTIVITY. |
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