Hi I'm portuguese but I'm living in england,and I want to go in holidays to portugal can I travel with mi id(bilhete de identidade)or do I need a passport?

Bilhete de identidade - Wikipedia, the free encyclopedia

"As the Bilhete de Identidade meets European Union identity card standards it can be used as a travel document within the EU, replacing a passport."

As long as it is still valid... "BI's are valid for 5 years from date of issue"