IN Brief:
- The MoD is extending Centreline Aviation’s Envoy IV support arrangement by two years at a maximum additional value of £26 million.
- The planned Phase 2 competition produced one tender that the department judged unaffordable, forcing an interim support solution.
- The extension maintains the aircraft and transition preparations but does not restart the separately paused work for operations in non-benign airspace.
Centreline Aviation will continue supporting the RAF’s two Envoy IV aircraft under a two-year Ministry of Defence extension worth up to an additional £26 million after the competition intended to establish their longer-term support and military modification produced only one tender, which the department judged unaffordable.
The interim arrangement preserves operation and support of the two Dassault Falcon 900LX aircraft while the MoD prepares another route to enduring support. Envoy IV operates from RAF Northolt in the Command Support Air Transport role, carrying high-priority military personnel and mission-critical freight.
The extension should not be interpreted as a restart of every element previously associated with Phase 2. Work intended to modify the aircraft for operations in non-benign airspace remains separately paused, with no definitive public date for resumption. The new support arrangement is principally a continuity measure following failure of the planned competition.
Phase 2 procurement fails to deliver an affordable bid
The Envoy programme was structured in stages. Phase 1 procured two Falcon 900LX aircraft and established their initial support and operating model with Centreline. The aircraft are military-owned but have operated on the Civil Aircraft Register, with Centreline providing the commercial operating and maintenance structure around the RAF service.
Phase 2 was intended to create the enduring arrangement through to the fleet’s planned April 2037 out-of-service date. Earlier procurement documentation included continued in-service support alongside military modifications and a proposed transition towards operation on the Military Aircraft Register.
The competition did not produce the outcome the department expected. Current contract information says the invitation to negotiate was withdrawn in November 2025 after only one tender was received and subsequently considered unaffordable. With no replacement provider contracted, the MoD faced a straightforward continuity problem: the existing service still had to operate while a new procurement approach was developed.
That makes the Centreline extension an industrial bridge rather than the final support solution. Extending an incumbent supplier avoids an abrupt transfer of engineering records, airworthiness responsibilities, maintenance activity, trained personnel, approvals, facilities, spares, and operational procedures while the department decides how to restructure the longer-term requirement.
Aircraft support contracts are particularly difficult to interrupt because responsibility cannot simply be handed over on the day a commercial agreement expires. Continued airworthiness depends on controlled maintenance programmes, engineering records, life-limited parts, defect management, configuration data, approved organisations, and competent staff remaining aligned throughout any transition.
The military modification remains a separate issue
The original programme envisaged greater military capability for Envoy IV after its initial entry into service. Earlier plans included transfer to military registration and modifications intended to support operations beyond the comparatively benign environments for which a civil business jet is normally equipped.
That work has slipped substantially from the early programme timetable. Current reporting says the non-benign-airspace modification remains paused, and the latest support extension does not announce its restart. Preparatory or enabling activity associated with a possible later transition should therefore not be described as delivery of the military modification itself.
The distinction is operationally important. Converting the registration and support model of an aircraft is primarily an airworthiness and organisational task; modifying it for operation in a higher-threat environment introduces a different set of design, integration, certification, and potentially sensitive mission-system requirements.
Each creates separate engineering work. A change in registration regime affects continuing-airworthiness responsibilities, approvals, engineering authority, documentation, and operating procedures. Additional military equipment may require changes to electrical power, antennas, structures, software, cockpit interfaces, communications, defensive systems, or other aircraft functions depending on the final configuration.
The current extension protects the service while those longer-term decisions remain unresolved. Centreline says it is already contracted by the MoD to operate the Envoy IV fleet from RAF Northolt and maintains the supporting aviation capability around the aircraft.
The RAF currently describes Envoy IV as a Falcon 900LX-based command-support aircraft operated by No. 32 (The Royal) Squadron from Northolt. The platform provides greater range and performance than the BAe 146 aircraft it replaced and is used for secure and discreet movement of personnel and critical cargo.
Commercially, however, the failed competition presents the MoD with another problem. Receiving one unaffordable bid can indicate that the requirement, risk transfer, available supplier market, timetable, or cost assumptions did not produce a viable competitive position. The department now has to decide what changes are required before returning to the market.
A replacement competition will also need enough transition time for any incoming supplier. Engineering and operational responsibilities have to move in a controlled sequence, particularly if government facilities at RAF Northolt, existing Centreline arrangements, and military personnel all form part of the future model.
The two-aircraft fleet makes the procurement unusually sensitive to disruption. There is little spare capacity if one aircraft is unavailable for maintenance or modification, so an unstable contractor transition could affect the operational service quickly even though the fleet is small in financial terms compared with combat-air programmes.
The £26 million extension buys continuity rather than resolving that underlying issue. It keeps the incumbent support structure in place while the MoD prepares the next procurement and gives the department more time to decide how enduring support, registration, and future military capability should fit together.
The next useful milestone is therefore a credible replacement competition. Until then, Centreline continues to support Envoy IV, the aircraft remain available for the command-transport role, and the more ambitious modification programme remains a separate unresolved part of the fleet’s development.
