Two senior executives of Goldshield, the listed drugs supplier, have been arrested and released on police bail after being interviewed by the Metropolitan Police. Ajit Patel, the chief executive, and Kirti Patel, the chief operating officer, were arrested and interviewed under the Police and Criminal Evidence Act in London last week. The two men were called in as part of an investigation by the Serious Fraud Office into suspected price fixing of generic medicines by drugs companies supplying the National Health Service.