Terrier is a highly mobile, general support engineer vehicle optimised for battlefield preparation in the indirect fire zone.

It will replace the existing Combat Engineer Tractor (CET) from 2011, providing mobility support (obstacle and route clearance), counter-mobility (digging of anti-tank ditches and other obstacles) and survivability (digging of trenches and Armoured Fighting Vehicle slots). Terrier will be faster and more mobile and will have more effective armour and mine protection than the CET.

Terrier is operated by a crew of two, or may be operated remotely in particularly hazardous environments. The vehicle can also tow a trailer carrying fascines, trackway and the Python minefield breaching system, clear scatterable mines, remove or enhance obstacles and establish routes while keeping pace with other armoured vehicles such as the Challenger 2 Main Battle Tank and the Warrior Infantry Fighting Vehicle.

Terrier is fitted with day and night vision systems and is air-portable.