BAA's proposals were/are to provide terminal capacity of 125 mppa.
Yes, 125mppa terminal capacity between the main runways. This has nothing to do with a possible R3 and T6 (+ T7, T8 ?).
BAA's proposals for the additional terminal extensions (+ satellites) is in BAA's published documents including its annual CIPs and annual / half yearly results.
Or are you suggesting Ferrovial etc misled BAA's new investors (China, Qatar etc.) that R3 was a given ?