This London firm helps to analyse the issues that arise during complex construction projects such as the Shard. Blackrock PM provides expert witnesses, construction consulting and tribunal services to clients including contractors, developers and government agencies. Private-equity firm Dunedin took a minority stake in the consultancy in 2015 to fund expansion, including an office in Dubai, helping overseas turnover to reach £22.8m in 2016. David Barry, 54, leads the company he started in 2009.

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Company details
Year2017
Rank36
CompanyBlackrock PM
ActivityDispute resolution consultancy
LocationCentral London
2-yr av intl sales growth pa78.51%
International sales £000s*22,780
Total sales £000s*25,716
Staff71
Founded2009
Websitewww.blackrockpm.co.uk

If applicable:

* Supplied by company † Annualised figure