This question already has an answer here:

I will be visiting Scotland and wondered if I can use my UK passport to enter so I can use the shorter line at immigration, then use my Canadian passport when I return to Canada?

marked as duplicate by JoErNanO, Gagravarr, blackbird, Gayot Fow, DJClayworth Feb 16 '16 at 17:44



Yes. It's not just a matter of shorter lines, in many countries you have to enter using the passport of country X if you're a citizen of country X.
