Tens of thousands of people on sickness benefits will receive backdated payments averaging £5,000 following government errors.
Some people have already received payouts of more than £10,000.
The mistaken calculations were made when people were moved on to the main sickness benefit, the Employment and Support Allowance (ESA).
The errors were first revealed by BBC News in November, but the scale of the underpayments has now emerged.
BBC News.
