So you're saying the flight was also conducted on an IFR plan using promulgated routes?
No. I don't think he was saying that at all.
I got the impression from the tenor of the original post that the flight was a local flight not conducted on an IFR plan nor on IFR routes and outside controlled airspace. Was I wrong?
I believe you were quite correct
If not I cannot see how this is a smart idea or even legal. What if some other idiot is doing the same thing in the same piece of cloud?
It is certainly legal in the UK. How smart you think it is, depends on how risk averse you are.
I agree with DeltaV, TOO, and ATC.
MJ