14. Dimension Data - £196.6m

The South Africa-headquartered integrator has seen its UK revenues decline about £20m since we compiled this list last year. Its core Network Services arm suffered a £6.4m operating loss in FY11, compared with a £7.3m profit in the prior year. Revenue declined 9.25 per cent to £162.15m.

As with most of its rivals, Didata made a big push into the cloud this year with the launch of a range of integration, consulting and compute-as-a-service offerings.