Prime Minister Boris Johnson was urged to rein in his tax-cutting plans amid warnings that a no-deal Brexit could blow a 100 billion-pound ($123 billion) hole in the public finances and lift government debt to its highest for half a century.

The Institute for Fiscal Studies says debt would climb to almost 90% of national income for the first time since the mid 1960s.

IFS says public borrowing will more than double next year whatever the Brexit result.