US President Donald Trump has kicked off his historic second state visit to the United Kingdom amid unprecedented pomp, intense security, technology investments and protests as King Charles and other royals welcomed their country's closest ally.

Trump and his wife Melania are being hosted by the King at Windsor Castle, the oldest and largest inhabited castle in the world and family home to British monarchs for almost 1000 years, where he is being treated to the full array of pageantry from a carriage procession to a lavish banquet.

The UK laid on what it said was the largest military ceremonial welcome for a state visit in living memory and 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

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