For most UK media companies, these are worrying times — audiences are falling, advertising revenues are down and there is seemingly no end to the digital disruption caused by tech groups such as Facebook and Google. But one corner of the sector, away from a general reader’s gaze, is not only defying gravity, but genuinely thriving. Business-to-business media companies such as Relx, UBM and Informa, were all, at one stage, predominantly print businesses: publishing trade magazines for a dizzying variety of interests and professional specialisms; from Hairdressers Weekly to the 282-year-old shipping industry journal Lloyd’s List.