The age of the car and the airline, regrettably.
Just today HMG have announced that they are considering watering down previously announced environmental measures.
The ban on new registrations of fossil fuelled cars and light vans is expected to be postponed by perhaps 5 years, and the ban on new gas boilers to become a restriction on numbers rather than a ban.
No new taxes on or restrictions on air travel.
No mention of railways, either electrification or more use of railways as presently existing.
No mention of trolley buses or battery buses. No mention of trams.
https://www.bbc.co.uk/news/uk-politics-66857551