Key workers in more than 5,000 stores, including Tesco, Asda and Primark, have been able to communicate safely and efficiently thanks to this Oxfordshire firm’s products. It has created a range of devices, including headsets and customer calling points, that keep colleagues connected regardless of where they are on the shop floor. Founded by Rob Gamlin, 56, in 2011, the company saw sales reach £13m last year. Its headsets — compatible with personal protective equipment — have been offered to NHS teams at a discount to aid hands-free communication in hospitals.