Congestion Charge or Other Factors?

What has put people on bikes in London? Livingstone would have you believe its the CC, but is it other factors...?

"London has witnessed a 43% rise in cycling since the introduction of the congestion charge and an 83% increase overall since 2000," it said.
Now, while I'm a fan of any measure that gets more cars off the roads, I think it's a bit rich for Livingstone to claim that his congestion charge is the reason why more of us are cycling. Although I was cycling to work before 2000, people I know who have taken it up in the last few years cite a number of factors, non of which feature the congestion charge.
"It's much quicker to get around", is the most popular reason, followed by "It's good exercise", while the astronomical price of tube travel has forced many people onto a bike.

Thanks - Guardian