Tom Anderson wrote:
On Fri, 23 Feb 2007, John Rowland wrote:

There is an obelisk in Circus Place with ventilation slots near the
top.

Could that be ventilation for the Central line?

The Central Line is not near Circus Place. It might be something to do with
Crossrail, although it's a little too far south, and probably premature!

Just to the south is a huge drain big enough to lower a van.

What exactly do you mean by a 'huge drain'? Could you give a slightly
more precise location?

http://maps.google.co.uk/?ie=UTF8&z=...02494&t=k&om=1

You can see the drain occupying one half of the width and one third of the
length of the road. The top of the obelisk is lit by sunlight just to the
north of the drain.