Getting the thread back onto the subject of handovers... and playing "Devil's Advocate" for a bit.
The current military prenote procedure almost doubles the workload effort. Despite pre-noting the releasing controller has to repeat a lot during the handover and the receiving team takes two calls.
Notwithstanding the needs of the Military Area Radar Units, what would be the problem in accepting a pre-note in the same way as a handover providing SSR is available?
The pre-note gives in advance everything you get from a formal handover except position/identification, but JSP552 allows for identification by observing a change of squawk, or selecting a pre-allocated squawk. So the track can be identified, all you might need is a LOA stipulating areas of overlapping cover... I cannot see a problem and would certainly aid flexibility and workload management.
But the greatest arguement is that it would negate the debate on this thread... and be another step towards Standardisation.