Not long after the UK left the EU in 2020, a Bristol-based firm called Eskimo started selling a new kind of high-fashion and energy-efficient electric radiator, based on new technology developed by academics in the city.They planned to send them around Europe using the Channel Tunnel.It was a timely product given Europe's green ambitions, and with orders flowing, its Birmingham factory was being kept busy.The boss Phil Ward tells me his start-up has continued to grow, but that in his view it cou...