From the BBC's election tracker:
"The Labour leader's flight back from Scotland to Stansted was delayed for half an hour on the tarmac at Edinburgh after the plane's computer system needed to be re-booted. On the tannoy during the flight, the pilot said: "This is probably the most high-profile flight I have ever done and right now I'm really embarrassed by the delay, but safety must come first."
In the light of today's sad events in Russia I'm not going to say anything nasty; it just seems that Brown isn't having the best of luck with his planes - one recently carrying as reading material an edition of the Spectator about why people should vote Conservative.
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