The 21-year-old was arrested at his family home in Sussex yesterday by officers from the Metropolitan Police on suspicion of violent disorder and attempted criminal damage of the Union flag on the Cenotaph on December 9.
He was taken to a Sussex police station where he was also questioned on suspicion of theft.
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Hide AdThe Cambridge University student issued a public apology after being identified as one of those who climbed on the Cenotaph, the nation's monument to its war dead, as thousands of youngsters vented their fury over the decision by MPs to treble university fees to a maximum of 9,000 a year.
A Metropolitan Police spokesman said Gilmour was bailed until a date in June pending further inquiries.