BBC's Joe Tidy spoke directly to those who claim they are responsible for hacking M&S and Co-op.

The deal could form part of negotiations taking place between the UK and EU on Monday.

Defence deals, fishing rights and closer economic ties among the talking points at Downing Street.

The retailer has been struggling to get its services back to normal after a cyber-attack in April.

Moody's said successive US administrations had failed to reverse ballooning deficits and interest costs.