Well, it's definitely reached the tipping point for me - I now catch the train to work.
It costs over £50 to fill up, up from around £35 not so long ago. It's a 50 mile round-trip each day and takes 45-60 mins by car each way.
Now, it's a 20-25 min walk to the station, 30 mins on the train, then a bus or 20 min walk. The trains are frequent and reliable, and at the moment the walk is fine but I am not sure I will continue it in the winter. But I probably will. Just using a weekly season ticket costs less than fuel for the car. I am looking into getting an annual ticket.
I can't drive to the station as I refuse to pay £5 a day to park there (now there's an incentive to get people onto the trains!), and I know that walking is better for me
I am also actively signing up with liftshare schemes but no success to date.