'Creative destruction'

The Institute of Directors has likened the protest to the machine-breakers of the 19th Century who tried and failed to stop the spread of the power loom.

"Black cabs have been a symbol of London for many decades, known across the world. But symbols, no matter how iconic, cannot be allowed to stand in the way of innovation," said director general Simon Walker 戒煙.

"Uber and its rival apps are an example of the positive disruption new technology brings, offering consumers new choices about how to travel.

"The battle over taxi apps gets to the heart of what creative destruction means. As a nation, we have to decide whether we want to open ourselves up to more choice and competition, or protect existing industries at the expense of consumers," he added.

Uber was taking the protest in its stride and not missing the opportunity to advertise its services.

"Our technology allows us to identify areas where demand is high and we'll be helping Londoners to get around town quickly and efficiently," said Jo Bertram, UK and Ireland general manager virtual office.

As well as London, traffic problems are expected in key European cities as traditional cabbies in Rome, Paris, Berlin and Milan join the protests 居屋二按.