London hotel owners were today said to be furious after mayor Sadiq Khan backed the idea of a tourist tax.
The proposal came in a City Hall report calling on ministers to devolve great tax-raising powers to Mr Khan.
Visitors would pay a surcharge on their hotel bills. The mayor also wants a share of the government's airports' tax, known as Air Passenger Duty.
Hotel trade body The British Hospitality Association described the bed tax as a 'absolute folly'.
Tourism is worth £36bn to London's economy every year, employing 700,000 people.