My hon. Friend has put his finger on the key question. Prison serves three fundamental purposes and we need to keep them all simultaneously. People must be punished for committing crimes. As a society, a civilisation and a nation, we must indicate that crime is unacceptable and deserves punishment. Secondly, people must be deterred from committing crime, and seeing a serious sentence imposed is an important part of changing behaviour. However, thirdly and fundamentally, people who come into prison must have their lives changed. That is fundamental for them, the prison officers who look after them and ultimately the public, whose safety and security depend on changing the lives of offenders and preventing them from offending again.