I know the European rules are a muddle right now. However, prior to this, the UK required a safety pilot to assist with flyin (23.2(b) of the Jan 2010 ANO) when conducting simulated instrument flight. Either the second pilot is required crew or he is not - and in this case he appears to be required. This could just be another UK oddball concept where two required pilots are still single crew, but I suspect not. Which leads me back to what if anything does one log if you are required crew but not PIC in a non-multi crew aircraft.