Chemist John Saville founded this York-based company in 1876 to develop photographs. Now run by joint managing directors Andy Dyson, 49, and Colin Nixey, 56, it has evolved into an audiovisual technology specialist with two brands. Sparq produces live events, such as conferences and product launches, while Visavvi installs video conferencing technology for corporate clients needing to communicate between international offices. Overseas sales hit £4m in 2017.
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