Can a UK citizen with a junior criminal record move to Portugal?

Given that you have Irish nationality and an Irish Passport, I’ll be answering this considering you an EU citizen. Your Irish citizenship and passport grant you full rights under EU Law to live, work, and study in Portugal. Since Ireland is an EU member state, you can rely solely on your Irish nationality for all legal and administrative purposes in Portugal, bypassing any reference to your UK connections. Portuguese authorities do not typically request criminal records for EU citizens when registering for residence (CRUE) unless there is a specific reason to assess public security risks. Nonetheless, even if a background check is initiated, it would primarily concern offenses tied to the EU citizen's nationality and documents (in this case, Ireland). Additionally, for reasons of public policy, public security, or public health, Member States may impose restrictions on the freedom of movement and residence of Union citizens and their family members, regardless of their nationality. However, measures imposed for public security or public policy reasons must adhere to the proportionality principle and be solely based on the individual's personal behavior. Prior criminal convictions will not be sufficient justification for such actions. The individual in question must pose a real, immediate, and significant enough threat to one of society's core interests via their personal behavior. Arguments based on general preventative principles or that are divorced from the specifics of the case usually are not accepted. With all this in mind, my answer to you would be: Yes, you are still allowed to move to Portugal.

All residence visas / permits for Portugal are subject to the analysis of the criminal antecedents of the applicant. The permit shall be denied if the applicant has been convicted of a crime that, under Portuguese law, would be subject to a punishment with a prison sentence of more than one year, even if this has not been served or its execution has been suspended. A concrete answer would always depend on the content of the applicant's criminal record certificate and the analysis of an expungement proceeding of such charges.