ANYONE can trace the original owner of a web site and inter account...but NOT the intelligence services. How do they get away with this?
What makes you think they don't know?
And how do you find the owner of sites in the UK, Europe and US behind anonymous hosting companies? The intelligence services can find it, but you can't - unless you are a spook or a cop.
And how do you think an anonymous hosting company in Iran would respond to a request from British Intelligence Services?