By Ali Lyon As software chief Matthew Scullion spoke to a room of capital market bigwigs at the London Stock Exchange last summer, there was an audible intake of breath. Scullion – a member of the Julia Hogget-led Capital Markets Industry Taskforce – had just revealed that of the $305m (£243m) his software firm Matillion had raised from investors, just $5m (£4m) had come from the UK. The rest had been pumped in from cashed up investors overseas. The huge gap laid bare the scale of the challenge facing the UK as it looks to unlock a wave of cash from investors and allow high-growth tech compani…