Consider online opinion polls around the Scottish independence debate. Whichever side you support, it's easy to recognise the political and democratic ramifications of an opinion poll being altered to reflect the current government's position.
Except there are plenty of real polls, being conducted by reputable polling companies, that people actually pay attention to. GCHQ aren't manipulating Scottish independence, they have plenty of Scottish staff, it would leak and that would be ammunition for the Nats.
