I am currently visiting my family in Canada. Normally I bring both my Italian and Canadian passports with me when I travel outside the EU, but this time I wasn't thinking straight and brought only my Canadian passport with me. So when I re-enter the UK, I will only have my Canadian passport; when it comes time to explain to border control that I am re-entering the UK to continue my full-time job, I will not have my Italian passport with me to prove that I have the right to live and work in the UK.
What should I do? Should I explain to border control that I am an Italian citizen at the border, even though I don't have the passport to prove it, or will this cause issues? I could see if I have any other documentation that indicates I am an Italian citizen. Also, I have a picture of my Italian passport photo page that I could show.