A heterosexual
couple have begun a legal fight at the High Court against the ban on
members of the opposite sex entering into civil partnerships.
Charles Keidan and Rebecca Steinfeld, from London, say their case is a "basic issue of discriminationand equality".
Miss Steinfeld said they want to commit to each other in a civil partnership as it "focuses on equality".
The Civil Partnership Act 2004 requires that partners be "two people of the same sex".
It grants gay couples legal rights similar to those given to married couples.
The government has said it consulted on the issue and found a lack of consensus, so does not plan to make any changes to the law.
'Modern social institution'
Mr Keidan and Miss Steinfeld want their relationship recognised in law, but they do not want to get married.Miss Steinfeld told the BBC: "We see each other as partners in life and want to be partners in law.
"We want to be able to celebrate our relationship with each other and formalise our commitment to each other within a social institution which is modern, which is symmetrical and that focuses on equality, which is exactly what a civil partnership is."
In 2014 they were told by Chelsea Register Office that they could not register a notice of intention to form a civil partnership because they were a man and a woman.
In the same year, the Same Sex Couples Marriage Act extended the right to marry to gay couples, who can now chose between civil partnership and marriage. The couple contend that the same choice should be available to all couples.
Karon Monoghan, QC for Mr Keidan and Miss Steinfeld, told the court that the ban on heterosexual couples entering civil partnerships was incompatible with their right to a private and family life, and discriminates against them.
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