Heavy Commercial Vehicle (HCV) includes vehicles that are generally used for the carriage of goods or burden of any kind and designed or adapted to have an unladen weight of more than 3,500kg (3.5 tonnes).
Examples include rigid bodied trucks, tipper, fire engine, box tractor units for articulated trailers also known as 'artics', buses and coaches.
Here are two examples to help you identify the details requested by NOVA.
Make: Renault Trucks
HCV type: Midlift Axle Tractor
Cab type: Sleeper cab
HCV type: Box
Cab type: Sleeper
All of the information referred to above should be available on the vehicle purchase invoice and in the vehicle manual.