Key points from article :
UK ONS figures for 2015-17 show life expectancy has stopped improving.
First time it has stalled since 1982 when figures began.
In some parts of the UK, life expectancy has even decreased.
Coincided with a bad flu season and excess winter deaths.
Some academics think government austerity policies have played a part.
It could be because it's hard to keep on improving every year.
