Lord Adonis, the IFG's boss and former Labour Transport Secretary, argued that London would not have had the Olympics, or Crossrail - the multi-billion rail tunnel through the heart of the city - or its congestion charge system, without an elected mayor.
Rail franchising was put on hold last year after a decision to award the UK's multi-billion-pound West Coast Main Line rail franchise to FirstGroup was scrapped by the government.
The government scrapped its decision to award the multi-billion-pound West Coast Main Line rail franchise to FirstGroup after "significant technical flaws" were discovered in the bidding process.