Perhaps the mods would like to split this discussion up to zone infringer's and flight planning ?
Regarding the comment about Bournemouth to BRI trainers, i am not sure why on earth you think DFC that we bin every flight plan.
Training aircraft generally want a period of time in Class A airspace as part of their flight. The most common route if training at Bristol is to route Bournemouth to EXMOR to gain an airways joining clearance then either a period of time within N864 before turning to the BRI for beacon training or turn at EXMOR for the BRI.
Flight plans are not discarded in anyway and both Cardiff ( who give the initial airways joining clearance ) and Bristol will have the information supplied to them as the Flight Plan will include the various reporting points, it is an IFR flight plan and all the appropriate people will have the information they require.
I really cannot figure the point you are trying to make BTW DFC. Flight plans with the correct addresses and reporting points end up at the correct units, we do not bin them.