BBC here – posted by the UKMO on Christmas Eve – a huge departure from their forecast of a year ago – thanks to Wayback machine.
I have stiched together the two forecasts so readers can best see the huge difference.

One point puzzles me and that is the difference in the white curves after 2007, marked on my graphic as 07. UKMO says – “Previous predictions starting from June 1960, 1965, …, 2005 are shown as white curves,..”. OK but is anybody aware that the post 2007 downturn was ever published as a forecast ?

The above little comparison shows the difference in the white curves better.
UK MP Mr Graham Stringer gives his views on the UKMO Christmas revision.