The Office for National Statistics has reported an interesting rise in the numbers of civil partnerships (despite the legal change in 2014 which allowed same-sex marriages as an alternative).  

It seems that civil partnership remains a compelling alternative for couples who don't like the traditional concept of marriage but still want legal and financial protection as a couple.  

Campaigners are keen to introduce civil partnerships for heterosexual couples for similar reasons.   A test case is likely to reach the Supreme Court later this year (further details can be found here: http://www.bbc.co.uk/news/uk-41004378