British citizens can stay in the U.S permanently if they hold an immigrant visa or green card, but they can only stay temporarily if they hold a nonimmigrant visa or no visa at all.
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WHAT SHOULD I KNOW ABOUT THE US TOURIST VISA VALIDITY? The B1/B2 Visa is valid for 10 years after issued, but for each entry, you are allowed to stay in the United States of America only for 180 days Per Entry or 6 months** (at most).
You must apply for a visa (B2 visa) if you want to stay in the U.S. for more than 90 days, no matter what the reason. You must apply for a visa (B1 visa) if you are traveling to the U.S. for employment or business purposes involving remuneration, even if not staying longer than 90 days.