Foreign Secretary William Hague said the "intelligence sharing relationship between the UK and US is unique and the strongest in the world and contributes to the security of both countries"
Answering a question on NSA surveillance, he said that intelligence gathering was "based on the framework of law."
Hague added that there "couldn't be two more trusted partners" on intelligence sharing in the world.
Earlier, Secretary of State John Kerry defended NSA surveillance, saying that "members of Congress passed all of this" and added that they had "voted for this several times."
"It's like a thief shouting stop thief," that's how a leading Chinese expert described the fallout from the NSA spying revelations.
The revelation of the Prism intelligence-gathering program will undermine the US' moral authority to deal with China over cyber espionage.
America's top intelligence official has called Edward Snowden's actions a "violation of sacred trust."