The old RB 106 voltage regulator box on the Minor was worn far beyond the famous cleaning of the contacts and output was always low, so when I saw a new "Lucas" branded one for sale I bought it. After fitting and cleaning the points twice nothing happened. It was dead. Then I remembered I had an old, later model British Lucas, three-bobbin box RB 340. Never had any trouble with those. After a bit of connectivation it worked fine. Good old Joseph Lucas!
The new "Lucas" copy RB106. 
Worn out RB106, new and old genuine "Lucas" RB 340 from a larger car I scrapped long ago..
RB340 from Wolseley 18/85 fitted to a humble Morris Minor. It works fine.
Even the ponies approve...