It is an offence for you or others to use your car without a level of car insurance that satisfies the Road Traffic Act whilst driving on the public highway. However, no such law applies whilst driving on private land.
The UK government introduced the original law back in 1930 which requires every person who uses a vehicle on the road to have at least third party vehicle insurance.
Third party only insurance is the lowest level car insurance cover available and is therefore often the most low cost. Third Party Insurance will only cover you for causing accidental damage to other people’s property and causing injury or death to other people. H