London Mayor's India trade mission incurred 25,000 pounds

Johnson has been known to attack his predecessor, Labour mayor Ken Livingstone, for extravagant trips, including one to India which is believed to have cost 740,000 pounds.

He, however, defended the bill saying, "It's something business always asks you to do. It's one of those things they all say is valuable to them. They always say London must be represented."

"My opposition was to spending a lot on PR consultants to handle the whole thing. We've done a much more economical version."

Johnson's Prime Ministerial-style week-long trip, which took in Delhi, Hyderabad and Mumbai, boosted the profile of London