So I did not imagine having problems with Mem Rcbo's testing at c/u.Thanks I got a call back from EATON MEM Techs today informing me that You can not test the Pod version MEM RCBOS of the terminal screw as it bypasses the torodial circuit, You must test down the circuit if connected or insert a conductor into the Live outgoing terminal and test between that and the Earth bar.
You can still learn something every day in this game!