Felicity Jones says 'The Theory of Everything' is a ''unique love story''.

The 31-year-old actress plays Jane, the wife of the theoretical physicist Stephen Hawking (Eddie Redmayne) in the biopic, and said the film portrays the couple's special bond.

She told BANG Showbiz: ''It's an incredibly unique love story and Stephen and Jane are both such phenomenal people and when you meet them, they're so witty. You know, there's nothing that you can say that can compete.''

The movie - which received its premiere in London on Tuesday (09.12.14) - follows the couple's 30-year marriage before their divorce in 1995, and is inspired by Jane's memoir 'Travelling to Infinity: My Life with Stephen', which detailed her relationship with the star, his success in physics, and his diagnosis of motor neurone disease.

Despite the couple splitting up, Felicity explained their relationship worked for so long because of their intellect and excellent sense of humour which helped them overcome their issues for many years.

She added: ''They're really sharp, sharp people, so we wanted to bring that humour that they both have into the film.''

Other stars in the film include Tom Prior, Sophie Perry and Finlay Wright-Stephens, who play their three children Robert, Lucy and Timothy as youngsters.