Yesterday I was driving around the edge of London's Congestion Charge zone when my SatNav fell off the window. While my passenger was grappling to put it back I got into the wrong lane and was forced to turn into a street that I think is part of the zone because I drove passed the signs. Once the satnav was fixed, we got back on track but I don't know at what point we left the zone - maybe 15-20 minutes later but it's hard to tell because I didn't see an obvious sign to say we were leaving it.
If I owe money then I'll pay up, but how can I be sure? The website allows you to enter a postcode to see if it's in the zone, but I don't know what the postcode was.
If I pay, but it turns out I don't owe anything, I don't suppose I'll get my money back, will I? But if I don't pay do I automatically get a fine? And if TfL's computer system can read my number plate, how come it can't check to see if I actually owe anything before it takes my money?