He said “a british voice,” which it almost certainly would be with those words, just like the voice saying “howdy” in most peoples heads is American. It’s not saying all British people would say that.
Most Brits would know that as a Texan accent honestly but it's a matter of semantics. I'm sure Americans realize "spot of tea?" and "chewsday" aren't the same accent even if they sometimes use them a breaths away when depicting "the British" accent. If I was to depict "the American" accent I would say "Tomato"
I've been bingeing some Silent Witness and Unforgotten and, while Canadians use both Yank and Brit phrasing, I've reeeeally been rocking out the rhyming slang.
Like "Septic", even when it's someone else on the news.