I'm a dual citizen; Canadian and Portuguese. However, I currently only have a Canadian passport and a Portuguese National Identity Card. Which immigration lane would I use when landing at LHR?

Entering the UK says I can enter with either a valid passport or identity card from a EEA country, but then it says here that at border control you can use the automatic ePassport gates if you're from the EEA, but the only passport I have is a Canadian one...