Client: UK Network Power


  • To design a new 2km, 132kV cable route from a substation to a switching station at West Weybridge, Surrey, passing under the M25, another major road, a canal and a railway
  • To respect and balance the interests of multiple landowners and other stakeholders


  • To design three horizontal directional drills up to 22m deep and 300m long so that settlement under the roads, canal and railway was minimised within acceptable limits
  • To reassure the client and stakeholders by including in the designs geotechnical analysis of the existing strata, predicted settlement calculations during and after drilling and devising a suitable monitoring regime
  • To demonstrate capability and competence through multiple iterations within the design phase


  • Designs approved by Network Rail, the Highways Agency and Surrey County Council
  • A comprehensive detailed ‘buildable’ design approved by the client and backed by relevant reports and calculations
  • Stakeholders could continue to use their land as normal as settlement was minimised