Key points from article :
Annual life expectancy at birth in Britain had never declined by 6 months since 1951.
UK presents life expectancy as three-year averages rather than as single-year estimates.
September 2018 report showed that life expectancy had stopped improving for the first time since 1980.
Winter mortality/influenza has had a more limited impact on underlying trends.
England experienced rapid and unexpected overall mortality improvement in the last 12 months.
