The two services that are most affected are the National Air Traffic services and the London Fire Brigade.

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Meanwhile, the SNP highlighted the rebellion by Labour backbenchers over plans to privatise National Air Traffic Services (Nats).

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The Ministry of Defence (MoD), National Air Traffic Services (Nats), Civil Aviation Authority (CAA) and RSPB Scotland have agreed conditions.

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The new "multilateration" monitoring system is a joint initiative by Oil and Gas UK and National Air Traffic Services Ltd (Nats).

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"It should be noted that not only do the MoD have no objections to this application, neither do the Civil Aviation Authority, nor National Air Traffic Services, nor Bristol Airport, " the firm said.

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