However, it's interesting to read the man's motives, which will prove embarrassing to the government.
Workers who processed the MPs’ claims included serving soldiers, who were moonlighting between tours of duty in Iraq and Afghanistan to earn extra cash for body armour and other vital equipment.
The soldiers were furious when they saw what MPs, including the Prime Minister, were claiming for and their anger convinced one of their civilian colleagues that taxpayers had a right to know how their money was being spent. The mole who leaked the data has told his story for the first time, in the hope that it will shame the Government into finally supplying the right equipment for the thousands of soldiers risking their lives in Afghanistan.
“It’s not easy to watch footage on the television news of a coffin draped in a Union Jack and then come in to work the next day and see on your computer screen what MPs are taking for themselves,” he said.
“Hearing from the serving soldiers, about how they were having to work there to earn enough money to buy themselves decent equipment, while the MPs could find public money to buy themselves all sorts of extravagances, only added to the feeling that the public should know what was going on.
“That helped tip the balance in the decision over whether I should or should not leak the expenses data.”
One of the expenses that particularly enraged staff was Gordon Brown’s claim for a Sky TV sports package, which cost £36 per month.
But it was the position of the soldiers, who had used their annual leave to find temporary work as security guards, that caused the most outrage. “As the days progressed the soldiers joined in the conversations and became as angry as those doing the editing,” the mole said.
“Everyone in that room was of the same mind. This was our money and these were our employees, effectively, but no one could hold them to account.
“Pretty much everyone working in that room was being paid a pittance to do their job. Meanwhile the MPs were being well paid and claiming a fortune on their expenses, yet what have they done for us in the last 10 years?
“That was why I leaked the information: because the British public deserves better.”
Indeed it does. I stick to the view that the mole performed a public service by leaking this to the Daily Telegraph, and the Telegraph were right to publish, even if some of the stories were reported in an unfair and lurid manner. Many MPs were correctly banged to rights, but there were quite a few innocent victims too. I am thinking mainly of those MPs who weren't mentioned but who were all tarred with the same brush.
So, yes, the mole did the right think and performed a public service, but we should also remember that he was paid handsomely for the information. The actual figure has never been revealed, but the sum of £70,000 has been mentioned. UPDATE: It has been confirmed that he was, in fact, paid £110,000.
I would like to think that bearing in mind what he says about his motivations, he has donated this money to Help for Heroes.
You can order the Telegraph book HERE.