It would appear that the co-ordination format hasn't changed in the 12 years since I last sat in front of a console; nor did it change for a 'career' before that since I learnt the job at Shawbury (with the exception that 'co-ordination agreed' was dropped, if I recall correctly).
Might it not be the case that much of the military's phraseology dates from procedures that had to be devised when primary radar was the norm in the terminal environment and secondary was nothing more than a 'slash' (ah, the mighty T82 at Midland) in the area world? Possibly, the problem is that those reactionaries at DAP (or whatever it is these days) haven't adapted to/adopted the technology since those procedures were first forged many, many moons ago.