74. CSA Waverley - £25m

The HP, VMware and Symantec partner is a new entrant this year, having posted some of the most astronomical growth figures of anyone on this list. Revenue runrate for the 11-month FY11 period was at £25m – up from just £9m in FY10. Predictably, margins suffered a little though, with operating profit growth coming in somewhat slower, rising from £559,333, to £938,693.