"I was very committed to the Olympic legacy. I felt very strongly that it was a commitment I made, and I made it to a lot of people in international sport. I certainly wasn't going to walk away from that.
"I still think it is perfectly within the wit and wisdom of all of us to make a multi-purpose sporting arena work for track and field. The rest of it is now firmly in the lap of the Olympic Park Legacy Company.
"I do think it would have been a fairly mystifying set of images that would have come through in six weeks had we been watching the news and the roller derby was taking place as the stadium disappeared.
"I am not sure that would have met with public approval."