I used my university degree certificate as proof of English and it was valid.

Does Portugal accept the dual nationality?

Is there a place where you can access statistics about timescales for the British Naturalization?

I think there should not be a problem for people who have worked in the UK to get a pension for the years worked in the United Kingdom. Historically, there have been many cases of people working in other countries and being able to claim a pension for the amount worked outside their country. Also ...