Home Counties accent (or even Received Pronunciation) do not pronounce "car" and the opening syllable of "character" the same way, since the 'a' in "car" is elo

Home Counties accent (or even Received Pronunciation) do not pronounce "car" and the opening syllable of "character" the same way, since the 'a' in "car" is elongated (I'm not sure what the correct linguistic term for elongation is).