Thank you, Ross. Both ORBs include reports of severe, or very severe icing at 9000 ft between 53 and 53.30 N, 01.30 and 03.30 E, and general complaints about the whole forecast being in error. Having accessed the German weather charts for the night I am pretty sure I know why, but would like, if possible, to develop a more complete picture. I also feel that a lack of data made the British forecast little more than a guess.

Although the German data are available online the same cannot be said for the British - and unfortunately the Met Office Library is closed.