Uk Patent Application

as in, can I use the exact same description and explanation of United States patent filing in the United Kingdoma

There is information missing from your question. How do you know that the patent is not valid in the United Kingdom if you have not already filed therea

If the same invention has already been rejected in the UK, it will not be saved only because he survived the U.S. examination. Each patent administration conducts its own independent review.