The thing is though, unless you have massive investment into public transport in a way that this country has never seen, you just won't get people out of their cars. In most of the south east there are decent bus services even in semi-rural areas because the sheer number of people there make it worth while for the service to operate. The same isn't true elsewhere in the country, where one bus every three hours between the hours of 8 and 6 is as good as it gets. That's impossible for many to use for work, etc. The rest of the country has different geography, different demographics, and different needs.
You're not going to get people out of their cars. People who work with technology can work from home, but those involved in manufacturing can't, nor can nurses, police, teachers, street cleaners, shop keepers, HGV drivers, etc, etc. Business owners who have the opportunity to make deals online, seem to prefer meeting in person for various reasons. I'm afraid the car is here to stay.
If politicians really cared about the environment they would be ploughing money into researching greener fuels or making electric cars a realistic alternative in rural areas (or even part financing manufacturing in this area). It's just used as a cover for garnering more tax though.
As an aside, there are many studies suggesting that people who work from home are more likely to suffer from depression, and I think it's important for people to have face-to-face contact in order to maintain human relationships. However, MrJP could well be on to something with a balanced week, with some work at home, some at work.