If an ATCO gets it wrong he is suspended.
That is most certainly untrue. If an ATCO was suspended for not following CAP413 exactly, there wouldn't be any ATCO's left.
In some cases CAP413 needs to be rewritten to cope with the real world.
I've just taken a look at CAP413 in relation to position reports, and I have never heard a position report being made using the standard 'correct' phrasology. I can certainly understand why the controllor was confused when given the 'correct' reply, in the case FFF over heard.
If a controllor is confused by a 'by the book' reply, what chance have foreign pilots who's first language is not English?
A little common sense needs to prevail too.
dp