Mayor Ken Livingstone has promised that the update of the London plan will include tougher eco-standards.

Livingstone, responding to questioning by Darren Johnson, London Assembly Green Party member, last week about raising environmental standards at the 2012 Olympics venues, said he wanted to introduce more exacting ecological construction standards across the capital in the review.

“The London plan was not as tough as I would have liked,” he said.

“I would expect standards to go beyond the legal requirements.”

He added that he wanted the 2012 Olympic Games to be a showcase for the approach to sustainable construction and design laid out in his recently published draft supplementary planning guidance on sustainable construction and design.

But Judith Salomon, planning director at business lobbying group London First, said the advice in the guidance was confusing for builders and developers.