Fascinating. I must have touched a nerve. Over the years, I have played 180 courses in GB&I and have been a member at two private clubs, so I am well aware of their system.
I'm with you, Tommy. I've played Sunningdale, The Berkshire, Swinley Forest and Worplesdon with a few days notice on a quick phone call...that qualifies as 'semi-private' by my American definition. I've also been a member of two clubs over there and probably played 40+ courses...a lot of work to catch up to you! I'd note you also can't 'rock up' to Bethpage or Pebble and expect to go right off.