Bicycle Tag of bike

There are a few, if you stretch the definition.

Lower Robert St remains the only London street that is underground for its entire (short) length, and is a through carriageway.

Yes, definitely stretching the definition--it's under cover, surely, but not actually 'underground'?

And then there is Little Compton Street http://greatwen.com/2013/11/07/secret-london-streets-beneath-streets-of-london/
Which is nothing more than a pair of street signs under a grating.

Yes, I've always thought that that was just a joke by the builders of the time. Or was the ground level actually raised at that time? I would have thought that many of the buildings on the former western bit of Little Compton Street, now part of Old Compton Street, were still the buildings that were there when Charing Cross Road was built?