Part of the debate – in the House of Commons at 4:07 pm on 10 June 2013.
There are undoubtedly cyber-attacks against all western intelligence agencies, including GCHQ, but GCHQ is particularly well adapted to defend itself against such attacks, and to have some idea of where they are coming from and when they are coming. I will not go into any more detail than that, but people would be quite fortunate to mount a successful cyber-attack against GCHQ itself.