GCHQ has done some appalling stuff, but the Google network penetration was done by the NSA.

You're both right, its a collaboration between the two:

>For the MUSCULAR project, the GCHQ directs all intake into a “buffer” that can hold three to five days of traffic before recycling storage space. From the buffer, custom-built NSA tools unpack and decode the special data formats that the two companies use inside their clouds. Then the data are sent through a series of filters to “select” information the NSA wants and “defeat” what it does not.

http://www.washingtonpost.com/world/national-security/nsa-in...