IPP petitions past and present:
https://www.ipetitions.com/petition/emmersons_ipp
https://www.change.org/p/end-indefinite-imprisonment-for-ipp-sentences-now
https://you.38degrees.org.uk/petitions/free-the-remaining-ipp-prisoners
https://petition.parliament.uk/petitions/637807
https://petition.parliament.uk/petitions/648601
https://petition.parliament.uk/petitions/636577
https://petition.parliament.uk/petitions/651881
https://petition.parliament.uk/petitions/599564
https://petition.parliament.uk/petitions/616699
https://petition.parliament.uk/archived/petitions/313682
https://www.change.org/p/amnesty-uk-to-back-campaign-against-the-ipp-sentence
https://www.change.org/p/ipp-let-my-son-rebuild-his-life-abolish-the-ipp-off-him