I have a rented car and I want to go to London on Sunday. I really don't want to drive on those crowded streets, so I just want to park somewhere outside of London Center and than take public transportation. Also, I hope to avoid paying that congestion tax.
So, what do you recommend? I'm coming from Dartford.
Dartford is already practically in London; you are unlikely to get anywhere much nearer. Trains from there go directly to Charing Cross, London Bridge and Victoria, which are right in the centre of town.
I don't know how busy these car parks typically are, but North Greenwich looks like the biggest one at a south-east London Tube station, and according to this page it'll cost £7.50 to park there all day on a Sunday.