John Rowland wrote:

From the maps on the cclondon website, it looks like the western extension
will include a number of cul-de-sacs, and similar, off the inside of the
cordon, for instance Blantyre Street, Childs Street, Redfield Lane, Lawrence
Street, Embankment Gardens etc. I find this hard to understand. How much
does each camera cost? Since Childs Street contains nothing but houses, all
of whose residents will qualify for the exemption, I wonder how long it will
take the Childs Street camera to pay for itself, or whether it will ever pay
for itself.

You might have a point - that said, doing it this way creates
uniformity and clarity.

One thing that I was never sure about was whether it would be possible
to get on the Westway from Edgware Road without going into the zone -
thankfully I see this can be done by going via Praed Street -
Eastbourne Terrace - Bishops Bridge Road etc.