i was informed the main cause as to the majority of the atc problems suffered by most to/from uk this afternoon was again due to a computer failure within london acc. followed not long after by the main computer that feeds info to scottish acc. slot restraints were imposed to reduce airspace capacity by upto 75% and then gradually recovered to near normal. the forcast rvsm problems had very little effect whatsoever.
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IT'S BETTER TO BE ON THE GROUND, WISHING YOU WERE IN THE AIR - THAN IT IS TO BE IN THE AIR, WISHING YOU WERE ON THE GROUND !