If your tractor is more than 25 years old you can take advantage of a vintage policy. I have four tractors on my small holding and have just renewed at less than £200 total for all 4. The cover includes agricultural use on my own land. .....not all vintage policies have this so beware. As others have said road tax is free so at subbing£50 a year to have it road legal why would you not, it so convenient for borrowing equipment from others or collecting materials.