A discussion in the Private Flying part of PPRUNE about ATC services outside CAS got the comment below which is generally as we understand it:
In fact controllers are specifically forbidden to give a higher level of service than what is requested.
This does raise the question though about what controllers should do when they have two aircraft on the same frequency heading towards one another, one is on a Basic Service and the other on a Traffic or Deconfliction Service?
- Tell one that they have traffic same level at 12 o'clock and the other nothing?
- Offer the Basic Service pilot a Traffic service and, if he accepts, tell him his future?
- Other?