Earlier quoted context omitted.
On the other hand, one can also question if the £16 cost for the flight makes any sense. A more correct price would be £500. It's about time that the airlines pay the same taxes for fuel as everyone else.
What is the correct cost for a flight leaving in 3 hours with an empty seat? What is the correct cost for a scheduled flight leaving in 2 months with no seats sold yet? Tickets aren't the same price for everyone, and planes fill to variable levels. Plus there are addons like luggage fees and beverages that have a huge markup. What is the best way to solve for that? Besides, it averages something like 53L of fuel/pass…
Another thing with flying is that it is so easy to go long distances as it takes limited time. A trip London-Barcelona is a 1.5-2 day trip one-way by car. You think twice before doing that. An intercontinental trip London-Bangkok is impossible by car, but creates more CO2 than all energy one person uses in a year (heating, cooking, going by car to work etc). Dirt cheap and in the blink of an eye.