Soldato
It is a term people use to describe Vehicle Excise Duty.
It is a legal requirement for using a vehicle on a public road and even the official government website describes it as 'tax' (https://www.gov.uk/vehicle-tax-rate-tables). As a result, people who say Road Tax instead of Vehicle Excise Duty are about 18 times less annoying than people who post WHAT IS ROAD TAX on the internet thinking it makes them look smart.
Thank you. I needed that chuckle.