"bestest" is an American hillbilly and Southern US usage [[incorrect, at least in current "proper" American English, as far as I know. But, isn't "gotten" currently the proper past participle for the verb "to get" in The UK? It certainly is in North America. I must be misunderstanding you. To me, your statement reads that one doesn't hear the word "gotten" in The UK, unless by an American 9the cousin reference I don't understand).
We say "have gotten" or "had gotten", as in the following sentence: "It has gotten colder here, since the Earth has been moving away from The Sun."
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