The price you pay will depend entirely on which tax band your car falls under, which you can find out from the Gov.uk website.
Vehicle tax rates for cars registered after March 2001 are separated into 50 bands that are based on several elements, including engine size, fuel type, and CO2 emissions. Cars registered after March 2001 and before April 2017 will sit within one of 13 bands based only on CO2 emissions - therefore, if your vehicle has emissions below 100g/km, you won’t need to pay road tax.