Excerpt from Hansard:
Lord Lawson of Blaby: My Lords, can my noble friend inform the House of the statistical and scientific evidence for the Met Office's estimate that there was only a one in 20 chance of a severe winter in 2010-11, an estimate on which the airports relied?
Earl Attlee: My Lords, my right honourable friend the Secretary of State has asked Sir John Beddington to give him scientific advice on the likelihood of future severe winters. On 25 October 2010, the Met Office provided the Cabinet Office with an updated three-monthly forecast, which suggested a 40 per cent chance of cold conditions, a 30 per cent chance of near average conditions and a 30 per cent chance of mild conditions over northern Europe.
Looks like Earl Attlee didn't answer the question, but good to have confirmation that the message we saw was the real thing.