Salix provides sustainable solutions to the challenges found in soil erosion control and river restoration projects. The 30-strong business has five offices in the UK in Thetford, Norfolk; Burton-on-Trent, Staffordshire; Cheltenham, Gloucestershire; Swansea, West Glamorgan and Inverness, Inverness-shire.

RSK CEO and founder Alan Ryder said: "I am delighted to welcome Salix's skilled and experienced workforce to RSK. Their services are an excellent complement to the group and will allow both businesses to expand their service offering. Bringing together our long histories of successful and sustainability-focused projects and experience of delivering innovative solutions in a range of sectors will enable us to deliver added value to our combined client base."

Salix will continue to be led by MD David Holland, supported by construction director Pete Barlow and financial director Edward Raker. Salix will become part of RSK's agricultural, land and property management division under the direction of Ian Strudwick.

"When I founded Salix 16 years ago, my core philosophy and ethos was to create an environmental business with strong sustainability principles that would lead the market in innovation for managing our rivers and wetlands. Our method is to combine ‘softer' solutions and to work with, rather than against, natural processes in a balanced way, and we see joining RSK as an opportunity to not only expand this approach but also to continue growing our business without having to sacrifice our culture and values,'' said Holland.

Salix is the latest acquisition under RSK's funding package from Ares Capital Europe and a revolving credit facility provided by NatWest announced in December 2018. RSK is investing in the development of new businesses, bolt-on complementary businesses, equipment and capabilities to increase its services and expand internationally. RSK now employs more than 3,600 staff in over 130 offices worldwide and has an annual turnover in excess of £250 million (US$323 million).