Spitoon, on the matter of separation particularly, the instructions to pilots contain the line:
"When pilots intend to apply corrections to the FAF crossing altitude, procedure turn or missed approach altitude, they must advise ATC of their intention and the correction to be applied."
That's in the Aerad supplement, certainly used to be in the Jepp guide, and is also contained in our company manuals.
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Interestingly, our company make a blanket statement that when under radar all assigned altitudes can assume to be tempereature corrected. PANS-OPS (Doc 8168), as well as discussing ATCs responsibility to provide corrections when radar vectoring, talks about the State's requirement to publish in their AIPs the criteria used to determine minimum flight altitudes and notes that where nothing is published it should be assumed that no corrections have been made.
I doubt very much that someone has trawled all the AIPs to check compliance!
Interestingly, the UK AIP in GEN 3.3.6 Minimum Flight Altitude (which is where the criteria should be) simply says 'to be developed'. So, do we now assume that the UK is to be treated as '... where nothing is published it should be assumed that no corrections have been made.' I think we should be told.