The man claimed to be a diplomat when he was stopped by security officers, a court was told
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Peter Herod, 61, was heading for a meeting with Labour MP Hazel Blears and Baroness Scotland when he was stopped and searched.
He was caught with the lock-knife, a court heard.
When security officers stopped him, he claimed he had diplomatic immunity, it is alleged.
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It is understood the man was trying to get to the UK launch of the Brussels declaration pledge to peace, held at the Palace of Westminster on June 17 last year.
Wearing a grey suit and an orange patterned tie at London's Southwark Crown Court, Herod denied having an article with a blade or point.
Herod, of Burr Street in Didcot, Oxfordshire, also denied possessing an article for use in fraud.
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His case was adjourned for the prosecution to check with government officials if Herod had diplomatic immunity.
Judge Alistair McCreath said: "They have a list of people who have diplomatic immunity.
"If you are not on it, end of."
The case was adjourned until April 9 at Southwark Crown Court.