The cost of running the 2012 Olympic and Paralympic Games has come in a further £151m less than its original estimate, prompting the Directory of Social Change to reiterate its calls for the unspent money to be redirected immediately to good causes through lottery distributors.

Sports minister Hugh Robertson yesterday revealed that lower-than-expected security costs, and a £20m payment from Locog for winding up the company, has resulted in a total £528m underspend on the London games.

“The scale of the London 2012 project has been huge and a complex one, and for the public sector funding package to be £528m under budget is testament to the sound financial management of all those involved in the process,” he said.

Last October the government estimated the underspend to be £377m. The new estimates fix the total public sector funding of the games at £8.9bn.

The news of the further savings has prompted the Directory of Social Change to again demand that the money, which was gleaned from lottery ticket sales, be redirected to those lottery distributers to end up with good causes.

In January this year, the sports minister indicated that up to £150m may be paid back to lottery distributers in 2014.

On the revelation this week, DSC head of policy Jay Kennedy said: “Great that they are spending even less than they forecast – now there is even less of a reason for delaying the £425m they owe to the Big Lottery Fund any longer.

“There is no excuse for making charities helping millions of people across the UK wait until 2030 to get this money back. Government needs to pay it back in full today!”

When the coalition government came to power, it stipulated that the government would repay the £675m taken from lottery coffers back to good causes by 2030/31. The DSC has been campaigning for this since the money was diverted from the lottery distributors.