Interesting postscript on Icing Clearance
The Master Airworthiness Reference (the Release to Service) was at Amendment 1 at time of accident.
A properly amended RTS (i.e. in accordance with accompanying embodiment instructions) does NOT mention icing clearance; superceding the clearance commonly mentioned here.
Not only does this cause confusion to those who would rely on the RTS at the time, it creates a conflict between the Master and subsidiary documents (FRCs etc) and is indicative of just how sloppy some parts of MoD were.
This error was rectified post-crash. Better late than never I suppose.