My understanding from following the news is that the ECHR ruled in 2008 that IPP sentences were against the human rights act. Happy to be proven incorrect sir.
On 13 November 2012, Shaun Docherty was convicted of wounding with intent. On 20 December 2012, he was sentenced to ‘imprisonment for public protection’ (IPP), even though the Government had, … Continued
This article suggests that it was the coalition government that abolished IPP and that decision was backed by The ECHR.
By my reckoning, The Tories have got rid of IPP and have failed to repeal automatic release at the halfway point of the sentence.