King Charles has greeted Donald Trump as the US president's historic second state visit to Britain began with unprecedented pomp, intense security, technology investments and planned protests.

Trump and his wife Melania arrived at Windsor Castle, the oldest and largest inhabited castle in the world and family home to British monarchs for almost 1000 years, where the royal red carpet treatment includes a carriage procession, gun salutes, a military flypast and lavish banquet.

Britain says it will be the largest military ceremonial welcome for a state visit in living memory.

Trump, an overt royal fan, has made little secret of his delight at being not just the first US leader, but the first elected politician to be invited by a British monarch for two visits.

On his arrival, the presiden

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