I think it was the selection of Teeside as the choice of diversion that seems a little 'odd', when there were clearly better choices available.
Can't find a forecast, but the actuals show for 3 hours from 1020-1320, the visibility never rose above 500m in freezing fog.
How strange this was 'apparently' unforecast???
Of course the met office have been known to make mistakes. Which is where 'airmanship' comes in. Can't help wondering what the forecast was on the 15th though.