Richard Todd was the Mine Surveyor during the life of Birch Coppice Coal Mine.
Graham Millward was the Mine Surveyor and Planning Engineer for a number of North Nottinghamshire Coal Mines.
Due to the contraction of the mining industry both men moved into the commercial sector with Richard forming Interlocks Surveys in 1995 and Graham joining later from a multi-disciplinary consultancy.
The company has also been a Member of a consortium team based in Hyderabad, India which designed and detailed a Project Report for a new Drift Mine in Kapuria, India.
Since 2013 Interlocks Surveys have been a principle consultant for safety inspections of disused/historical coal mine shafts and adits throughout the UK. Reporting to a government body on the effect to public safety regarding access, gas and the potential for mine water contamination.