Where do they send all the records and documents of closed down British Embassies?

Question

For a research that I am doing, I needed to find out a British Immigrant that lived in 1700s in Porto, Portugal.

However, the British Consulate/Embassy in Porto closed down many years ago, and I don't know where they sent all those documents and records of all those British People living in Porto from 1600s until the 20th Century. They must have had a register, but where is it now?

I appreciate any SERIOUS help from any one who has knowledge on these things.

Cheers

Answer 1

Try the national archive at Kew

or

http://www.nationalarchives.gov.uk/

I'm not saying I know just this is where I'd ask

Answer 2

Contact the Foreign Affairs Department of UK to know where the files of the embassy in Porto were placed.

Answer 3

i honestley dont know, but try the closest embassy to porto there is now, if that dosent work try asking someone like your local mp, even try emailing the foregn office or the goverment, if its a legit case they may help you.