Ok all good points so far..
However..scenario was..
F3 was u/s IFF and the realeasing agency was aware of this fact. The F3 was at FL240 and requested to freecall the next agency as he was 10 miles from his start point for the exercise. The releasing agency told him to maintain FL240 and cleared him to freecall.(yes I know if an aircraft wants to go en route in class G then there is not a lot to stop him). Nearest stranger was approx west 10 maintaining FL145 so not a priority confliction had the F3 maintained FL240. The releasing agency recommened maintaining FL240 although the stranger WAS NOT called in.
F3 mate goes on route and decsends and pitches up on next agencies freq with no Mode 3 and in confliction. Obviously all the controller can do is ask for Hgt and identify him though by this time it was to late and the 2 a/c merged co-lvl (although it later emerged neither were visual.
Obviously there is not a lot of blame to be passed here(and that is most certainly what i'm not trying to do) as all agencies followed correct procedure.
Was just after thoughts/comments on this situation which unfortunatley could have been far worse!!
Appreciate comments so far and have taken on board!
Polo
And just as an add on...
DFC pilot was aware his IFF was u/s
and
ADIS5k we were the receiving agancy...
Ta
Polo