John Crompton Whitehead

Spi Piling Ltd. is a leading steel piling contractor that specializes in both temporary and permanent steel piling techniques. The private company is based in Lancashire, UK. The British company is also the authorized dealer for Gilbert Inc., manufacturer of the GRIZZLY MultiGrip™ vibratory pile driver. Additionally, they are a leading specialist subcontractor within the soil stabilization industry.

A.E. Yates Ltd. is a civil engineering and tunneling contracting British company founded in 1870. The private company is based in Bolton, UK and has subsidiaries in the United Kingdom. The company provides contracting services in these areas.

Combined Soil Stabilisation Ltd. provides soil stabilization, bulk earthworks, and plant hire services. The private company is based in Bolton, UK and was founded in 1979.