42. Jigsaw 24 - £51.1m

The reseller, which styles itself as the UK’s number one Apple and Adobe dealer, added more than £10m to its top line in FY11, while operating profit grew from £745,000 to just over £1.1m. The firm’s customer roster includes a host of big-name media companies, such as the BBC, ITV, Sky, ESPN and News International. Jigsaw 24 has divisions focusing on audio equipment, computer-aided design and architecture technology, the broadcast and post-production sector and the education space.