Q&A: Incapacity benefits crackdown explained

The government wants to reduce the number of long-term claimants of incapacity benefit

Thousands of people on incapacity benefit are receiving letters asking them to be reassessed on their ability to work this week - but why is it happening and what will it mean for those affected?

Why is the government sending out letters?

How many people will receive letters?

Why is it happening now?

What will happen as a result of the assessments?

What do charities say?

What does the government say?