Hi
Last year I paid £10 also.
Yesterday we went to the wedding show there and paid £10 for 3 hours!
That was in the underground car park as the big one in front of excel was closed.
I think you could park around the area and walk in, but not sure where. Plus if you buy lots or heavy things you dont really want a long walk back to your car!
The DLR runs there too so that would be a cheaper option.
I agree its too expensive for a car park, its extra expensive to go this year being as you have to pay to get in as well, its not as if you get goodies and freebies like how it was years ago, or even products etc VAT free.
Emma x