Roch - Our Structural Testing Saves Lives. Roch ndt Services is the Industry specialist for the Structural Testing of Lighting Columns, Signal Poles and other vertically mounted Poles. We are the only legally licensed company permitted to use the Roch Force Deflection Test Method in the U.K. The Roch method is a conclusive Test Method we have successfully used in the U.K. for over 27 years and we support this with our indicative Test Methods providing professional structural column assessment along with our comprehensive data collection service.