The Labour Party has criticised the cost of the new buses, accusing Boris Johnson of being "lavish" with taxpayers' money. They will cost £354,500 each.
Val Shawcross, the Labour transport spokesman on the London Assembly, said:
"There are plenty of green, environmentally clean, buses available on the mass-market now...the mistake that Boris has made here, is he's gone for a new tailored bus so he's paying way over the odds.
"He's probably paying over £100,000 more for each of these buses, so it's a very large waste of money.
"We could be getting the environmental benefit without paying this huge premium."
More top news
The London Mayor has made some forthright comments about Britons who have been lured to join Islamic State.
Bright spells with rain, sleet and snow showers at the weekend.
As soon as the information went missing in early January, the Ministry of Justice say they launched an urgent investigation.