The determination of whether a pilot can comply with the minima for operation in VMC lies with the pilot
I agree with that statement but that avoids the question I posed.
ATC issues the Clearance based upon some reported weather minima determined NOT by the Pilot. ATC has to decide if the Controlled Airspace can be done VFR, SVFR, or IFR. When issued a VFR or SVFR Pilot....compliance with that Clearance requires the Pilot to operate within the limitations of the ATC Clearance as to route, height, and any special instructions. If the Pilot is unable to maintain VFR or SVFR he has to report that to ATC and announce his intentions/desires to include requesting an IFR clearance.
Is that how it works over London?
Or is there Uncontrolled Airspace over London that does not require an ATC clearance at all....or would not require an SVFR or IFR Clearance when weather minimum for that airspace is below VFR minima?
Is there a clear cut answer to this....that someone knowing can answer?