you can laugh boys but I have been told something similar by an Eastern European TRE.
His method coming out of Manchester would have had us going through Rosun hold at FL90 going to take up the hold at MAN and going no where near POL.
Although to be honest if I was flight planned from a ickle regional airport down to Gatwick I would be very tempted to not go into London airspace with a radio failure and go somewhere else out the way, out of controlled airspace after doing the 7 min thing with 7600 on or return back to the point of departure.
To be honest that rule is great in theory but sometimes I think there would be a lot easier ways for all concerned better ways to do it. But its very hard to make a rule up which states go somewhere sensible which isn't gong to cause mayhem.