yes, indeed, there seems to be some confusion over this issue, some say pics on your phone will do, others you need your original documents, passport.
I have requested posters on many occasions to say which law says you need your original passport, nobody has replied.
It would make sense in this day and age of digital technology that the immigration police would have apps on their phone which can interrogate the immigration database and have facial recognition technology, there bye making the need to carry a passport non existent?