Over 40% of Scotland’s tech start-ups and scale-ups are targeting the US market for growth but have found access to finance the biggest barrier to their ambitious plans.  That’s one of the key findings from a new survey of 100 data-driven tech start-ups and scale-ups, undertaken ahead of this year’s Engage Invest Exploit (EIE) by the event’s organiser Informatics Ventures, and conference sponsor TalentSpark.