Purely out of interest, what is your source for that quote?
Ah yes, that would have been Lord Davies of Oldham in the House and who may just have been advised by the CAA.
I suggest you try reading the definitions in ICAO Doc 9342, CAP 413, and ITU documents.
I did. I thought Lord Davies had probably reflected the CAAs current view more accurately.
Moreover, I thought his views reflected a far more accurate assessment of the position - one in which the captain is not expecting to "crash" but requires the immediate attention of AT