The Royal Borough of Kensington and Chelsea has decided to test two-way access for cyclists on six of its residential roads.
The scheme is a tester to see whether legalising against the flow of traffic cycling:
a. makes any difference at all. (as many already cycle against the flow to save time)
b. causes an increase in collisions.
If there is no 'significant' increase in collisions, then the scheme will be extended to other streets in the area, which will likely provoke other councils to follow suit.
In some boroughs, cycling contraflows already exist, but uptake of these lanes has not been huge due to cost of segregating cyclists from traffic.
A complete article offering a for and against comment is available here.