There are some 10m office PCs in Britain and 1.8m are regularly left on overnight or all weekend, according to a recent study on energy wastage. Software developer 1E is behind Nightwatchman, which automatically installs night-time updates and shuts off unattended computers, saving energy. Its other core product helps businesses reduce their number of servers. Focusing on selling to large enterprises such as Nestlé and Verizon has helped turnover at the London firm grow 65% a year from £3.5m in 2004 to £9.5m in 2006, under chief executive Sumir Karayi.

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Company details
Year2007
Rank70
Company1E
ActivityEnterprise software developer
LocationWest London
Average 3 year sales growth65.10%
Latest sales £000s9,498
Staff49
Founded1997
Websitewww.1e.com

If applicable:

* supplied by company † annualised figure