Only has to serve six years

>Miles, of Southwark, was convicted of manslaughter at Inner London Crown Court after pleading guilty to the charge. He was cleared of a charge of murder.

>Judge Benedict Kelleher sentenced Miles to eight years imprisonment with an extended licence period of five years.

>But he will serve less than five-and-a-half years in prison before he will be eligible for parole.

https://www.dailymail.co.uk/news/article-14845561/tube-passenger-killed-gentle-engineer-jailed.html