Forest Land Rover (left) - Land Rover Cuthbertson (right).

The 'Forest' Land Rover was built by Roadless Traction of Hounslowfor companies needing a vehicle with superb traction and ground clearance such as the Forestry Commission. Most of the 20 or so built went overseas.

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James A Cuthbertson Ltd was an early manufacturer of rubber tracks, dating back to World War II, and designed the first endless rubber belt. This led to many further developments based on applications for his invention, including half tracks and Land Rover conversions specifically for farmers forced to work in an uneven, hostile landscape.

Source: wikipedia.org