Just out of interest, the part number number EP11/11 is actually a registered design from the BBC Designs Department. They sold the rights to produce their designs to companies like Alice etc
Info on the meaning of the various codes can be found here:
As a Beeb bod, this got me interested, but even after some “googling”, I couldn’t find anything about the EP11/11.
(Out of interest, Mike Law is now of BCD Audio)