I think everyone is in agreement on that one........
the ideal solution is a seperate freq but there isnt one at present. Our Mil pilots call PPs frequently on PETF (even whilst undergoing initial flying training operating relatively simple ac) because they recognise a need. Civil pilots do not have a PETF so their choice is use 121.5 as legislated in this country or dont practice...... Many of the ATSUs particulary in the busy SE, just dont have the capacity to offer the pilots of GA ac the oppurtunity to practice emergencies on their discrete ATC freq. Indeed at times when they get a puddle jumper type that has a minor emergency they sometimes dump him across to us as they are stretched to capacity & sometimes cannot offer him the full assistance he needs.
I completely understand reasoned opinions such as those expressed by Effohx, but it is the system that is in place at present and is there to be used.
If anyone has a mate who can provide another VHF freq to be used as a VHF PETF you would have the unreserved support of all those who work In D&D.
Diddley Dee