I've added the Network Rail shots, courtesy of an engineer who works at both Orlando Street and Farnworth Tunnel, to Fillie's album here:
https://www.flickr.com/photos/127646831@N03/albums/72157657384006325
In 5064g, taken on 19 Sep, there are 20 rings up to and including the sixth light on the left.
There are about 10 further lights in sight and the lights are about every third ring. That means about 30 further rings, or 50 rings in total.
Each ring is 1.4m so that's about 70m plus the length of Fillie, which I think we estimated as about 20m.
So they've done about 90m and are about a third of the way through.
They begin to be under the A666 when they reach half way.
Have we had a progress figure since Geeves was there on 26 Aug when they had done 45m? She's done another 45m in the 24 days from then, but that's including the unknown time she was stationary.
I suppose the most optimistic assumption is that she can do the remaining 180m at the originally planned rate of 6m a day, which would imply a breakthtough about 19 Oct.
