巴打諗成點,抑或brexit後用passaporte移民ireland再用common travel area住dublin/london? 哩招work唔work? - should work, but you will "waste" at lease 5 years of your life in Ireland!
http://www.inis.gov.ie/en/INIS/Pages/WP16000022#eu-eea-swiss
3. Application based on residence for UK, EU/EEA & Swiss nationals
To apply for citizenship by naturalisation based on residence,
you must prove that you have been resident in the State for at least 5 years (1825 or 1826 days) out of the last 9 years
This includes 1 year (365 or 366 days) of continuous residence immediately before the date you apply.