Eiji Aonuma and Koji Kondo were there. If you got to meet them then that's freaking amazing
Yep they were in London, Koji Kondo played an piece of music of Grandma's theme from Wind Waker on the piano that wasn't mention on the program so it was a huge surprise. There was a blooper though that the mic fell down but he carried on playing.
Eiji was there at the beginning thanking us for being fans of the series, 25 years, etc and he was back towards the end of the concert talking about Skyward sword and the concert CD that came with it.
There are a few videos of the queue in London, heck you might even see me! I received nearly ~150-200 Streetpass Miis completing the puzzle pieces and cleared the Streetpass quest for the first time.