To think when we were at the development and planning stage of The Amex many long standing supporters, myself included, said the hard core fan base was about 7,000 so a 20,000 capacity would more than accommodate the JCL.
That is probably why he said it was possible but would be very expensive. He suggested the attendnace could be increased by about 50% I dont know as I know nothing about it and just repeating what he told me on one occassion.
Richard Hebberd once told me that the footings are sufficient for another tier all around the ground if needed but it would be a very expensive job and there would obviously have to be the demand to warrant the expenditure. I would expect the planning permission to be a formality
I would think it is possible to make the capacity larger if we ever got to be a consistent top four side but that is a long way off. I do remember when I was lad Chelsea being a lower 1st Div team along with Fulham so anything is possible.