One of the UK’s largest communications firms had a leading role in creating the surveillance system exposed by Edward Snowden, it can be revealed.

Watch the interview on Channel 4 News from 20 November with German MP Konstantin von Notz and former head of GCHQ Sir David Oman here.

Read the background story „Spy cable revealed: how telecoms firm worked with GCHQ“ with a statement of Konstantin von Notz here.