Redbar1, please could you quote the bit of FCL that requires a flight with an FI.
1.215 states "... In order to change to another type or variant of the aeroplane within one class rating, differences or familiarisation training is required"
1.235 states "Familiarisation training requires the acquisition of additional knowledge"
My understanding is that, providing there is no system which requires differences training, it is permissible to read the POH and fly. Life would be very tedious for some people if this were not the case.
HFD