For those who want to read the CW views on Swanwick.
Go to the
Computer Weekly website and type NATS into the search box at the top left of the homepage. You will then see all the articles.
Scroll down to read the ones written in 2000 and 2001 about the software problems at Swanwick. The one about voice comms is quite supportive of ATCO fears about sidetone at the time.
GW