I was an illegal alien in the US for approximately 18 years. I entered legally but overstayed. At that time I was a citizen of India. A friend of mine procured a fake South African passport for me, which I never used. A US citizen I showed it to complained to DHS, they informed the police and I was arrested and sentenced to a year in jail for "Criminal possession of a forged instrument". I served 8 months (4 off for good behaviour), and was deported back to India.
Now in India, my family happens to have roots in Goa (my dad was born there in 1950), and I was therefore able to acquire Portuguese nationality because of that. Now I have a Portuguese national ID card and passport. I have not lived in any EU country. However, I visited the UK 6 times when I had Indian citizenship.
I want to visit the UK to see a sick relative. Will I be allowed entry? I am aware that the UK is still part of the EU. Given my conviction in the US, and the fact that info is shared between the UK and US regarding criminal foreigners, will I be allowed to enter? I am not interested in settling/living/working in the UK; I have a decent job and life here in India.