This London company works in partnership with the likes of T-Mobile and Orange to provide discounted international calling services. Customers obtain an access code that allows them to make cheap international calls from their mobiles. Core Communication Services was founded in 2005 by chief executive Tony Greaves, who helped to demerge the mobile-phone firm O2 from BT in 2001. Sales have grown 111% a year from an annualised £2.9m in 2005 to an annualised £27.2m in 2008. The company has a high profit margin.

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Company details
Year2009
Rank11
CompanyCore Group
ActivityTelecoms services provider
LocationCentral London
Average 3 year sales growth111.35%
Latest sales £000s†27,168
Staff13
Founded2005
Websitewww.coretel.co.uk

If applicable:

* supplied by company † annualised figure