So, controllers - I'm on a long leg, I'm IMC qualified, I may well be flying quadrantal rule (or can easily adjust my height to do so), and receiving a basic service. VFR/IFR hasn't been discussed, no flight plan has been filed -I'm just flying in open FIR. And there's a big bank of cloud in front of me - so I elect to fly through it, as there's no reason not to. What do you want me to tell you? Serious question, as I really cannot recall ever being taught this.
I've always wondered that too. I've also called in class G on a basic service to say I'm going VMC on top or just IMC if there's a bit of clag in front and the a/c is settled nicely in the cruise. All I've ever had back is 'G-**** roger.'