A civil registrar who refuses to officiate at partnerships between same-sex couples, claiming that it is “sinful” and against her religion, has brought a legal case that could have implications for ceremonies conducted throughout the country.

Lillian Ladele, 47, a Christian, said yesterday that “as a matter of religious conscience” she could not perform civil partnerships for gay couples.

She has accused Islington council, in North London, of religious discrimination and victimisation because it asked her to perform the ceremonies as part of her £31,000-a-year job.

Employment lawyers said that the case, which has angered gay rights groups, could affect councils throughout the country. It is expected to lead to a landmark ruling over whether employees can be required to act against their consciences.

More than 18,000 same-sex ceremonies are performed each year under the Civil Partnership Act, which came into force in December 2005.

Clare Murray, of the employment specialists CM Murray LLP, told The Times that Ms Ladele’s case could affect the way that councils throughout Britain organise their civil ceremonies. “They are all governed by the same legislation,” she said. Even if Islington did lose, other councils might be able to argue that they were justified in requiring registrars to officiate for same-sex couples.

Ms Ladele said that Islington council was forcing her to choose between her beliefs and keeping her job by requiring her to undertake civil partnership duties. Giving evidence yesterday, she told the employment tribunal in Central London: “I hold the orthodox Christian view that marriage is the union of one man and one woman for life to the exclusion of all others and that this is the God-ordained place for sexual relations. It creates a problem for any Christian if they are expected to do or condone something that they see as sinful. I feel unable to facilitate directly the formation of a union that I sincerely believe is contrary to God’s law.”

More than 600 gay couples have had civil partnership ceremonies in Islington, making it Britain’s third-most popular borough for the service.

Ms Ladele, who has worked for the council for 16 years, alleged that she was accused of being homophobic by gay colleagues at Islington town hall and was shunned by staff after refusing to carry out civil partnerships.

She claimed that she was “ridiculed” by her boss, the superintendent registrar Helen Mendez-Childs, when she raised her concerns about the new ceremonies in August 2004.

Ms Ladele said that her superior had told her that her stance was akin to a registrar refusing to marry a black person.

For 15 months she swapped with colleagues to avoid the ceremonies. Formal complaints were made about her in 2006. Ms Ladele, who said that she was surprised that colleagues were offended, said that the council gave her an ultimatum to carry out the ceremonies or face being dismissed for gross misconduct.

She said that, to “punish” her for a principled stance, she was denied the chance to preside over lucrative weddings staged at special premises. “There was no respect whatsoever for my religious beliefs,” she said.

n 2006, Ms Ladele and another female registrar, who shared similar beliefs, were formally accused by two colleagues of “discriminating against the homosexual community”. An internal disciplinary investigation as to whether she was guilty of misconduct began in May 2007.

Ms Ladele said that staff started to act in a “different, hostile way towards me”. “I continued to be civil towards everyone. People would just blank me. It hurt so badly,” she said. She claimed that before the furore she had been conducting about fifty marriages a year but was then allocated as few eight per year.

Britain’s 1,700 registrars were effectively freelance and could opt out of ceremonies until last December, when they were brought under the control of town halls.

Ben Summerskill, of the gay rights group Stonewall, said that public servants were paid to “uphold the law of the land” and could not discriminate. “Doubtless there were those 40 years ago who claimed a moral objection to mixed marriages between those of different ethnic origin,” he said.

Mike Judge, a spokesman for the Christian Institute, said that the matter was “an important case for religious liberty”. He said: “Other occupations allow conscientious objections. No homosexual couple is being denied their right to marriage, because other registrars are performing them.”

Islington council denies religious discrimination or victimisation, and claims that Ms Ladele’s stance breaches both its dignity-for-all policy and its code of conduct for employees.