As an ex-Londoner, I was very appreciative of the free travel I had when I lived there. Meant I was able to get our and around, not using a car. When I was looking after my small grandchild we could go 'up west' to see Lights at xmas, and to museums, etc.
Think it is even more important that 'young people' had free travel. When mine were attending 6th form colleges to which they had to take a bus, not sure how I would have managed if they had to pay on these. So many younger Londoners now do not use cars at all, as there is such good public transport and they learn to use that when they are in their teens and it is free for them.
If we really mean to try to cut back on individual car use, throughout the country -then the first stage has to be a really good, trustworthy public transports system, and this has to be either free or very low charges. Yes, that means highly subsidised - but in the long run, that will be so much better for everyone.
Remember the future belongs to the young, not to us. We have had our time