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Labour Deputy Leader Harriet Harman, her husband and fellow Labour MP Jack Dromey and former Labour health secretary Patricia Hewitt were all prominent figures in the NCCL, which granted PIE affiliate status in 1975.

Lord Justice Fulford said he attended several meetings of the NCCL's gay rights committee, at which Mr O'Carroll was "sometimes present", and this had left him feeling "extremely uncomfortable".

The Mail has said Ms Harman "tried to water down child pornography laws" during her time at the NCCL.

Mr Dromey, who served on the NCCL's executive committee from 1970 to 1979, has said he made "repeated public condemnations" of the pro-paedophile group,

Speaking on BBC Radio 4's Today programme, O'Carroll confirmed he had been on one of the NCCL's committees and had been involved in a variety of discussions.