- Dating back to 1911, national insurance was first implemented so working class people had some insurances against illness and unemployment.
- This was expanded after WW2 to help fund the NHS and other social security schemes.
- The Government has set national insurance at 12p for every pound earned.
- It has grown up in parallel with income tax, which traces its roots to the 18th century and is administered separately.
More top news
Pollution claimed nine million lives in 2015, with air pollution from vehicles and factories accounting for 6.5m deaths, researchers found.
Donald Trump has given himself a "10 out of 10" for the response to the widespread hurricane devastation Puerto Rico suffered.
Police in Los Angeles have opened an investigation after another sexual assault allegation was made involving Harvey Weinstein.