Thanks
Here are a couple of guardian articles at the top of a search,

It not MI6's job to warn of internal threats. It was a very strange speech. Was it one branch of the intelligence services sending a shot across the bows of another? Or was it pointed at Theresa May's government? Does she know something she's not telling us?"
Senior intelligence analyst, April 2017
https://www.theguardian.com/technology/2017/may/07/the-great-british-brexit-robbery-hijacked-democracy 


4 March 2017 ... questions that are vital to the integrity of our democracy and what it means to be a citizen in the digital age. Was the referendum free, fair and legally fought? Were voters covertly manipulated without their consent? And, crucially, what role exactly does Robert Mercer – Donald Trump's biggest donor and close associate of Steve Bannon – have in all this?
https://www.theguardian.com/politics/2017/mar/04/cambridge-analytica-democracy-digital-age