Last year, there was a carry-over of €250 million in unspent money.

However, instead it was agreed that unspent money from the DfE's maintenance budget would have to be deployed.

Some lawmakers worried that some of the targeted unspent money was still needed, such as funds earmarked for fortifying U.S. coastlines against hurricanes.

The remaining funds will come from unspent money from last fiscal year's budget and money originally allocated to servicing existing debt, the sources said.

The parliament's political groupings have agreed a proposal that would provide £78 million of the fund from unspent money originally destined for other projects.

The fund will collect unspent moneys from the NDIS as well as "the proceeds of savings measures from better targeting our welfare spending".