It's worth remembering that Gareth Williams worked on some very sensitive cases..
...Williams flew up to four times a year to the U.S. to the NSAs headquarters at Fort Meade HQ, according to the Mirror. His uncle, Michael Hughes, told the paper that Williams would mysteriously disappear for three or four weeks.
The trips were very hush-hush, Hughes said. They were so secret that I only recently found out about them and were a very close family. It had become part of his job in the past few years. His last trip out there was a few weeks ago, but he was regularly back and forth.
Williams was said to have worked with the NSA on e-mails intercepted between Abdullah Ahmed Ali and Assad Sarwar and Rashid Rauf, a British national in Pakistan who was allegedly director of European operations for al Qaeda. The e-mails, intercepted by the NSA in 2006, allegedly contained coded messages.
The NSA shared the e-mails with British prosecutors but wouldnt allow them to use the evidence in an early trial of the suspects out of fear of tipping off Rauf that he was under surveillance. It was only after Rauf was reportedly killed in a U.S. drone attack that the NSA allowed prosecutors to use the e-mails to convict the other suspects. Its never been known whether the NSA intercepted the messages overseas or siphoned them as they passed through internet nodes on U.S. soil as part of the NSAs controversial and unconstitutional warrantless wiretapping program...
http://www.wired.com/threatlevel/2010/08/codebreaker-death/
Also worth noting that he was found inside this bag...
With that lock on it.