Get an electric car
Invest in an electric car. Most electric cars are expensive but the second-hand EV market is rapidly growing.
Here are some new electric cars for under £30,000 from December 2020 (sorry it's not the most updated).
EVs may have a higher up-front cost but not needing to pay road-tax, in the UK, and lower maintenance costs makes EVs cheaper to run than petrol cars. EVs are also easier to drive as they don’t have the need to switch gears. This results in a smoother driving experience for everyone onboard.
Here is my video about the top 5 cheapest EVs: