Here is a list of the top 10 IT companies in the UK for offering services, and tech support. check the list and read about their services and consulting. 1. Hyperlink InfoSystem Hyperlink InfoSystem is a well-known web and mobile app development company based in London, UK, with a development center in India and offices in the United States, United Arab Emirates, and France. The company's experienced team of over 250 developers offers first-rate services in Web & App developm