[stoneman24]

If I remember correctly, the visa free travel (esta) asks about arrests as part of the information. Even if you were never charged, never trialled, declared innocent at trial. I would imagine that this would include a uk police caution as well. For all matters, even if under uk law, these are minor and spent (no longer needed to be declared within the uk).

Just mention the UK, but I am sure that other countries have thier own procedures but the US wants all the details for thier own examination.