There has been no expense spared for the UK's biggest security operation since the King's coronation.

This time the occasion is both royal and presidential. It is vast and honestly feels, well, American.

The operation has been led by Thames Valley Police, but officers from across the UK will also play a part in the visit.

Windsor is a sea of fluorescent yellow jackets and black and white flat caps. Officers are swarming the town and over the next couple of days will be sending drones into crowds, conducting boat patrols and deploying mounted units in and around the wider area.

Authorities have planned for every eventuality but would not expand on whether the fatal shooting of Charlie Kirk had led them to heighten security measures.

Image: Officers patrolling the River Thames

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