So given that you can nearly always get at least a basic service and given that if you are in IMC you are IFR then I dont think it is acceptable to switch to IFR without telling the obvious service provider. Clearly it is also not acceptable having told the service provider where you are and at what level not to report any change in level or course
That's fine, but what difference are you expecting from the ATCO if you declare you are now IFR, but still on a Basic service and do not request a surveillance service or procedural service (from non radar units) by declaring that?
Also remember under a basic service you are not required to give a change of course and/or level.
As for flying a Procedural approach ATCO's never assume anything
. You can be IFR or VFR on a procedural Service as you can on all the ATSOCAS services now.
Remember it's the contract (service requested), that will dictate the level of traffic information or deconfliction advise given. Not whether you are IFR or VFR.
