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Unless we're talking about Lieutenant Commander Data from Star Trek. Then it's Day-ta. But that's like how you say Dragonball Zee and not Dragonball Zed. Names don't count.
I live in South East England and have never heard anybody say dah-ta, so I don't know where you other British PCers are from but your accents are a bamboozle.
I use both pronunciations with process. The verb is always praw-cess, but for the noun I don't know that I have a rule, just whatever sounds best to me in the flow of the sentence.
I usually say dah-ta but I'm pretty sure I've also used day-ta on occasion, too.