Edward Snowden has warned that surveillance technology is so much more advanced and intrusive today it makes that used by US and British intelligence agencies he revealed in 2013 look like child’s play. In an interview on the 10th anniversary of his revelations about the scale of surveillance – some of it illegal – by the US National Security Agency and its British counterpart, GCHQ, he said he had no regrets about what he had done and cited positive changes. But he is depressed about inroads into privacy both in the physical and digital world. “Technology has grown to be…