Inner London first I reckon. It really isn’t needed where I live. Out walking/running and people are literally scared of coming within a few metres of each other.
I was walking down a 100 yard passageway this morning and a guy was walking towards me and we would have met half way. He turned around and walked 50 or so yards so he could step aside and not get too close to me.
The long term psychological effects that social distancing is going to have on us will take years to overcome.