Adjacent to the Inland Revenue building is the underpass between

Snakes Lane East

and

Snakes Lane West

. Sissons claimed that the tiles in the passage were left over from those used in the Greenwich foot tunnel. Certainly recent analysis from the tiles suggests similarities to the ceramics manufactured in Derby by J.Proudfoot and son. Traces of alluvial clay similar to those that underly the Greenwich delta have also been detected. Cobbing made investigations into the origin of the nomenclature 'Snakes lane'. Thus far he has found no mention of reptiles existing wild or being kept as pets by local landowners in the area. Cobbing did unearth a passing mention of 'the Cult of the Serpent' in a magistrates' will from 1786 but has so far failed to make any sense of this.