The Duke and Duchess of Cambridge and Prince Harry are on a visit to the new Warner Bros. Studios in Leavesden, Hertfordshire.
William was invited to try out the bike used in the Dark Knight trilogy, the Batpod, and also got to see the revving engine of the batmobile, named the Tumbler.
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PC Keith Palmer, 48, stabbed by Khalid Masood while on duty in the grounds of the Palace of Westminster last Wednesday.
Engineering firm CH2M won the £170 million contract but have pulled out of phase two of the project over alleged conflicts of interest.