[r-t] Exceptions to the Extension Rules

[Graham John]

Has anyone compiled a list of rung methods which don't conform to the current
rules on extension? If not let's compile one - which ones can you think of? 

I'll start with:-

Group 1. Valid extensions with different names

- Glasgow S Major, Clyde S Royal, Strathcylde S Maximus
- Leatherhead S Major, Maximus, Fourteen, Sixteen, Kegworth S Royal

Group 2. Invalid extensions with the same name

- Rutland S Major & Royal?
- London S Minor & Major?

Graham