I've just read the June GASIL. It contains a piece on CAP 717 referred to earlier on this thread -- a report from the 'Avoiding Action Working Group.'
However, the GASIL article distinguishes between two phrases with the following paraphrased explaination:
" 'G-AAA, turn right 60 degrees for avoiding action' (standard separation can not be or has not been achieved, the aircraft to which the advice is being given will come close to the other one)"
and
" 'G-AAAA, avoiding action, turn right 60 degrees' (the controller is concerned that a real risk of collision exists if the advice given is not followed immediately)'
I can see no mention of the first type of phrasology in MATS pt 1 and it seems to me to be dangerous to have two very similar phrases with quite different levels of urgency.
This thread has already shown that ATCOs and pilots do not all interpret this life-saving instruction in the same way. This article seems to confuse an unclear situation still further.
Regards