Julian Assange.
A London radio station has crunched the numbers after a freedom of information request revealed the Metropolitan Police had spent 9 million pounds ($NZ18.6 million) guarding the Ecuadorean diplomatic mission to the end of October 2014.
That's 10,500 pounds ($NZ21,725) per day, and given Assange has been inside the embassy for 960 days since June 19, 2012, the total figure to date is now just over 10 million pounds.
A frustrated British Deputy Prime Minister Nick Clegg on Thursday insisted the Australian should leave the embassy and "face justice".
The WikiLeaks founder is avoiding extradition to Sweden over allegations of sexual assault.
Assange fears if he's extradited he could subsequently be sent to the United States and charged over the website's release of classified documents.
Britain's Foreign and Commonwealth Office says the government remains committed to reaching a "diplomatic solution".
"We are clear that our laws must be followed and Mr Assange should be extradited to Sweden," a spokeswoman said in a statement on Thursday.
"As ever we look to Ecuador to help bring this difficult, and costly, situation to an end."
London deputy mayor for policing and crime Stephen Greenhalgh acknowledges the STG10 million figure is "an eye-watering amount of money".
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Assange guard bill tops $20 million