A new occupation on the streets of London is that of a traffic marshal. I'd never heard of them until this year and now they seem to be everywhere. There is a tremendous amount of reconstruction going on in London, in particular with the new cross rail going from one side of London to the other. As a consequence pedestrians need to be managed as well as traffic hence the need for these marshals.
These photos were taken near London Bridge rail station. It is the first time I have seen one of these concertina type barriers being used to close the road to traffic
They work very well as they are quickly manoeuvered into position and the road is only closed for a minute or so to allow a lorry to reverse out of the construction site.