DFC,
I don't really see the point you are trying to make. but if you are concerned about an alerting service then just call the appropriate en route ATC unit like the rest of us do. It's simple enough.
If your "system" of written flight plans for every VFR flight were to be brought into force it would make the job totally impractical. Keep the freedom we have in the UK, get airborne and get on the radio.
