Founder and chief executive Simon Osman, 39, set up Viastak in 2011 after selling his previous business, a telecoms company, to Telinet in 2008. It has spent five years developing its iFollowOffice product, a remotely accessible computer desktop allowing companies to switch all applications and storage to the cloud. The majority of Viastak’s sales come from its IT services, infrastructure and audiovisual businesses. Projects for customers such as the Royal College of Psychiatrists helped sales hit £6.4m in 2015.