As a data point, going two ways between zones 3 and 1 by tube is 8.7 pounds a day, and it will go up soon. If you include 2 people in the family, the convenience of dropping off the kids at their schools, etc 15 pounds doesn't sound that bad for the car, if you have where to park.

That's probably excluding parking. I would expect the day rate for that to be quite steep.

Then it's not wonder people would rather cycle. What a deceptive headline.