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Prince William and Kate Middleton's wedding day was a joyous occasion celebrated by thousands across the UK in April 2011.

However, despite police arranging for 5,000 officers to be stationed across the scene, the momentous day, which cost roughly £24,624,500, was very nearly tarnished after an unidentified vehicle slipped through security and pulled up outside of the hotel she had been staying at.

"My fear is there's some sort of 'Guy Fawkes-ean' plot going on behind closed doors to actually potentially put a bomb somewhere," Bob Broadhurst, The Metropolitan Police Gold Commander on the wedding day, said in the ITV documentary The Day Will and Kate Got Married.

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Bob explained that they were on high alert for the "odd individual" or "fixated people who for whatever reason are obsessed with the Royal Family who might just sneak under your car."

For all their efforts, 20 minutes before Kate, 39, was due to leave the Goring Hotel in Belgravia to meet 38 year old Prince William down the aisle, police were alerted to the appearance of an unidentified vehicle entering the secure zone.

Bob insisted he still has no idea how the vehicle could have slipped through the radar as he said: "I don’t know how it happened and I don’t really want to know how it happened to this day.

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"But someone in a car got through the secure zone, drove up close to The Goring just around the corner, got out the car and legged it and joined the crowd.

"Now we have a real problem. This is a potential bomb in the car."

As the car was parked quite close to the entrance of hotel where Kate, whose uncle recently lifted the lid on her "fairytale" romance with William, was due to appear out of, the police were forced to consider changing their plans, making it a possibility that she wouldn't make it down the aisle on time.

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"You could cut the silence with a knife while we're trying to solve this issue," Bob said on the tension in the room.

Thankfully, explosive officers investigated the scene and established there was no bomb inside the car, allowing the bride to stay on course with the original plan.

While Kate was safely in a car with her father Michael Middleton on her way to Westminster Abbey, the individual who left the car behind came back to find no doors or windows on his vehicle alongside a parking ticket.

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