By Elliot Gulliver-Needham Disinfectant supplier Tristel reported its pre-tax profit rose by 39 per cent to £7.1m over the last year, as the cleaning company appointed a new chief exec to its helm. The company, which primarily sells disinfectant chemicals for medical devices to hospitals, reported record revenue and “strong cash generation”, in its audited preliminary results today. Turnover jumped by 16 per cent for the firm to £41.9m, while its adjusted pre-tax profit (before share based payments) increased 32 per cent to £8.2m. Located in Snailwell, near Cambridge, Tristel employs around 25…