I'm not sure if GOSH can actually legally block derivative works, the relevant clauses are more about claiming a royalty, not a continuation of copyright, ie:

I'm not sure if GOSH can actually legally block derivative works, the relevant clauses are more about claiming a royalty, not a continuation of copyright, ie: https://www.legislation.gov.uk/ukpga/1988/48/part/VII/crossheading/provisions-for-the-benefit-of-the-hospital-for-sick-children https://www.legislation.gov.uk/ukpga/1988/48/part/VII/crossh... "Provisions for the benefit of Great Ormond Street Hospital for Children. The provisions of Schedule 6 have effect for conferring on Children's Charity for the benefit of Great Ormond Street Hospital for Children a right to a royalty in respect of the public performance, commercial publication communication to the public of the play “Peter Pan” by Sir James Matthew Barrie, or of any adaptation of that work, notwithstanding that copyright in the work expired on 31st December 1987." GOSH can of course maintain a moral right as intended inheritor of the rights to approve disprove or derivative works, but as the copyright has expired I'm not sure if they have many legal rights. (Not a Lawyer, etc. etc.)