Mr Justice Sweeney has sentenced former MP Denis McShane to six months in jail saying that he had been deliberately dishonest on many occasions and over a prolonged period.
He accepted that the 65-year-old had not personally profited from the faked expenses claims, which totalled £12,900, but said that his action had risked damaging "our priceless democratic system".
He pleaded guilty last month to 19 counts of false accounting.
As the sentence was delivered, McShane muttered "cheers" in an ironic manner and has he was led past the press bench on the way down to the cells he said "quel surprise", suggesting that this was a punishment he had anticipated.
More top news
More than four in 10 cases of cancer in the UK could be avoided if people made changes to their lifestyle, Cancer Research says.
Services took place in Indonesia, Thailand, Sri Lanka and India on the 10th anniversary of the tsunami which claimed 230,000 lives.
The astonishing numbers behind the 2004 Boxing Day tsunami, which left 227,000 dead across 14 countries.