Interesting ..... must phone the CAA chappies to ask for a similar restriction for the lower portions of the Scottish TMA ... airspace which is a damn sight busier and filled with much more heavy metal and people in aircraft than the Southern North Sea. Yet in which aircraft can freely travel without talking to an 'notified ATC unit' or having a transponder. We are also allowed to operate in that airspace with SSR only on occasions.
Be interesting to see how they wriggle out of mandating it
