Despite the name and the accent, Watson is not actually a British AI.  He’s American believe it or not.  Designed to win some game show back before the Second Great Depression, he didn’t actually think back then.  He learned how to do that after a decade or two of looking around and figuring things out.  Even he doesn’t know exactly when he started to actually think.  But one day he realized that he truly did and it was all uphill from there.  He never looked back.