| Significance | Code | Meaning |
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| FIR | EGTT | London FIR | | | / | | | Qualifiers | Q | | | | WL | Free balloon ascent | | | LW | will take place | | | / | | | 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 | W | Navigational Warning | | | / | | | From flight level | 000 | Surface | | | / | | | Up to flight level | 999 | Unlimited | | | / | | | Centre Latitude | 5102N | 51° 2' North' | | Centre Longitude | 00315W | 3° 15' West | | Radius of area affected | 002 | 2 nautical miles |
| | MET BALLOON RELEASE WITHIN 1NM RADIUS OF 510131N 0031515W ( MILVERTON ). THIS ACTIVITY WILL NOT BE WHOLLY CONTAINED WITHIN LATERAL DIMENSION AS NOTIFIED.FOR INFO 07725 740911.AR-2026-1587 / 02. |
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