Drainage

 - OS19X qualification - analysing and classifying piped drains and sewers, designed for those with no prior experience
 - OS20X qualification - for piped drains and sewers, designed for those with previous experience
 - OS21X qualification - a three-day course focused on classifying brick sewer conditions.
 -Water Jetting Association Certificate

Investigations

 - Sonde tracing is a technique that uses a small, battery-powered transmitter called a sonde attached to a flexible rod or camera to locate underground pipes, drains, or ducts. The sonde emits a detectable signal that is tracked above ground by an engineer using a receiver, which indicates the precise location and depth of the pipe.
 - Ground Penetrating Radar (GPR) - a non-intrusive geophysical method that uses high-frequency radio waves to image subsurface structures and objects, such as utilities, archaeological features, caves, and voids

Other

 - Design, construction, modification, maintenance and decommissioning of filling stations - 3rd edition by The Association for Petroleum and Explosives Administration (APEA) and Energy Institute (EI), London

Other Info, News, and Updates

 - A handy drain clearing tool - The Best Tool I Never New Existed