This London company’s reusable steel water bottles, an alternative to single-use plastic water bottles, have proved a hit in mainland Europe. Overseas sales — through its multilingual website and distributors — reached £12.3m in 2019, driven by a focus on social media marketing. Co-founders James Butterfield and Tim Bouscarle, both 31, have expanded the range to include reusable coffee cups and have recently launched Chilly’s in America, Australia, the Middle East and parts of Asia.