Anglo Platinum, for example, has not yet received converted rights for existing mines, but is confident that it will, and says the delays have not affected operations or investment.

ECONOMIST: Mining in South Africa

It is not yet clear how much worse things will get as existing stocks run down.

ECONOMIST: Japan and the global supply chain

But it is not yet clear whether parents will be better off under the new scheme or the existing voucher schemes.

BBC: Parents 'to be able reclaim up to ?1,200 of childcare costs'