Hi all

.
It's more or less been solved! Walking away from City Square on the right of Bishopgate Street (where Boar Lane has just met it) the start of the Neville Street road tunnel is quickly met. Almost at once in that there is a tunnel on the right that you used to be able to walk along quite a long way until progressed was barred at where, or very close to where, the River Aire would had started to run underground. I suspect the tunnel was not a public right of way, though on my few visits nobody ever stopped me! A year or so back a blue metal shutter was installed that stopped access after only a few yards in, so there is now only private access for vehicles and people beyond that point. I think there might be access to the Queens Hotel and possibly to the station.
The artwork is on the right just inside the entry to that tunnel (I don't know however if even that small area is private). Though it seems separate from what is general taken to be the Dark Arches I would think it was probably constructed at the same time (I wonder if there is a 'hidden' direct connection to the Dark Arches?).
To my surprise I seem to not have any photos showing the start of the tunnel off Neville Street. I do though have some that I took inside the tunnel on April 3 2012 so I thought I would post 3 of them. The first is a view looking back to Neville Street, the second is a view looking to the far end and the third is a photo taken at that end. The latter has the nice Queens Hotel car park sign (but I wonder if that had been moved to there) and there is a locked access that does not seem wide enough to let cars through (I suspect it may lead to the River Aire).
Sorry for this very long post! I hope it is of interest.

- TunnelViewLookingToNevilleSt(BishopgateEnd)LeedsApril032012.jpg (99.79 KiB) Viewed 15649 times

- TunnelViewLookingAwayFromNevilleSt(BishopgateEnd)LeedsApril032012.jpg (89.09 KiB) Viewed 15649 times

- EndOfPublicAccessOfTunnelFromNevilleSt(BishopgateEnd)LeedsApril032012.jpg (88.89 KiB) Viewed 15649 times