Re: Treatment of IFR flight plans (UK, outside Class A)
If you are routing from Goodwood via CPT on an IFR plan OCAS. Why would you want to route via MID?
To me that route takes you closer to the LTMA lower base levels and on the MID-CPT leg takes you closer to Farnborough (more chance of a conflict with departing/arriving traffic and thus vectors or restrictions).
I would probably route out towards the Popham Area to pass south of Lasham and then direct to CPT. That route enables height to be gained sooner because of the higher base levels.
However if you really want to go via MID then by defining the position as a radial and bearing from GWC eg GWC030012 (I have not checked this is actually MID) will get round the computer checking the MID CPT leg against the SRS. You can use the same system to define places like SWB which are not in the system.
Regards,
DFC