This week, a relatively young cybersecurity company called Darktrace announced that it has raised an additional 65 million ( 50 million) at a suspected valuation of over 400 million ( 308 million). No other UK tech startup has announced a funding round anywhere near that size since the UK voted for Brexit. We caught up with Mike Lynch -- the billionaire founder of enterprise software firm Autonomy and Darktrace's first big name investor -- to find out why he decided to put his money into the company. "The reason I liked it was that it was a completely new approach," said Lynch during a phone call with Business Insider on Wednesday. "Most of what's out there in cybersecurity is based on knowing what you're looking. So things like anti-virus and that sort of stuff or trying to build a big wall around the outside of your company, a boundary. "The problem is that the world's moved on and the attacks no longer have signatures.