Women and girls in need of abortion services in Northern Ireland are being treated as "second-class citizens", the UK's highest court has heard.
Supreme Court justices were told of the "healthcare plight" at the start of the latest round of a legal battle by a teenager and her mother for those resident in Northern Ireland to receive free abortions on the NHS in England.
Stephen Cragg QC, for the mother and daughter, told the court at a hearing in London on Wednesday: "Women and girls in need of abortion services in Northern Ireland are in an anomalous position.
"They live in the UK, but - unlike all other women and girls in the UK - they are at risk of the most serious criminal penalty if they procure an abortion in their own area."
He pointed out that, "unlike all other women and girls in the UK", they cannot access abortion services through the NHS free of charge.
He further added that abortion has remained unlawful in Northern Ireland "in all but a tiny number of extreme cases".
The young woman at the centre of the case was 15 in October 2012 when she and her mother travelled from Northern Ireland to Manchester and was told she had to pay hundreds of pounds for a private termination because she was excluded from free abortion services.
The teenager and her mother, who cannot be named for legal reasons and are referred to as A and B, originally lost their action in the High Court in London in May 2014 when a judge ruled that the exclusion was lawful.
He concluded that the Health Secretary was entitled to adopt a residence-based system so that women resident in Northern Ireland are not entitled to benefit from NHS abortion services in England - even though they are UK citizens.
The High Court judge declared that A had no right under Article 8 (right to privacy and family life) of the European Convention on Human Rights to a state-funded abortion, and there was no breach of anti-discrimination laws under Article 14.
The teenager, now 19, and her mother, then suffered a further defeat at the Court of Appeal last year.
The Supreme Court's deputy president Lady Hale and four other justices are being asked to rule on a challenge against the Court of Appeal's decision.
Mr Cragg argued that the stance of the Health Secretary, that abortion services should not be made available for women from Northern Ireland, was "unreasonable and at odds with international norms requiring the UK as a whole to ensure access to safe abortion and post-abortion care services".
The "healthcare plight of a section of the UK population" was being ignored, he submitted, arguing that the Court of Appeal "erred" in its conclusions.
- WATCH: The teenager's solicitor Angela Jackman, from Simpson Millar LLP, spoke to UTV from London