London - (Meltdown): The atomic device is believed to have been hardwired into the North London hospital's foundations circa 1974 by KGB bastards squatting in Michael Foot's potting shed.
The 5 megaton AN602 hydrogen bomb - nicknamed the Tsar Bomba - is a virtual replica of the original prototype on exhibit at the Russian Atomic Weapon Museum in Bloodyvostock.
The device was built into Royal Freak's foundations as a precaution in case anybody ever found out the sordid truth about Mrs Thatcher.
At the hospital plant room today engineers battled to reconnect the power supply after an emergency glitch shut down the entire 20 acre medical complex.
A back-up generator, on loan from Marine Ices Gelateria in downtown Chalk Farm, struggled to provide enough juice to run the first floor wards' ladies loos extractor fans.
A number of operations had to be cancelled including Jerry Halliwell's cranial bypass and remedial ingrowing toenail transplant.
Vladimir Putin is 69.