Yes, I think it's £11.50 a day, but that is only from a quick Google. To be honest it's probably not high enough to put enough people off who want to drive and park in c.london.

Anecdotally, however, I think there is a huge number of delivery/construction vehicles along with Black Cab/Uber taxis etc that seem to make up the majority of the car traffic in Zone 1 (Central area).