Birtain's top court said yesterday it had rejected an application by WikiLeaks founder Julian Assange to reopen his appeal against extradition to Sweden over alleged sex crimes, ending his last legal recourse in British courts.

The Supreme Court rejected his argument two weeks ago that a European arrest warrant for extradition was invalid, but his lawyers had argued that some of the judges had reached their decision based on a legal point that had not been argued in court.

The court said all seven judges had agreed the application was without merit.

"The court has ordered that, with the agreement of the respondent ... the required period for extradition shall not commence until the 14th day after today," it said.

Assange, who denies any wrongdoing in Sweden, could still take his case to the European Court of Human Rights, a move which could hold up the extradition.

Swedish prosecutors want to question Assange over allegations of rape and sexual assault made by two female former WikiLeaks volunteers. He has been in a legal battle against extradition since his arrest in Britain in December 2010.

Assange gained international prominence in 2010 when WikiLeaks began releasing secret video footage and thousands of US diplomatic cables in the largest leak of classified documents in US history.