After last month's flooding, the ticket gate line is still completely out of order. Apparently, Oyster users will have their journeys auto-completed. Two big poster stands explain all this - placed right in front of the labyrinth! I don't think they would have appreciated me insisting on photographing the labyrinth and trying to move the stands, so I had to make do with the serial number through the small gap. I will have to come back at a later date.
In October I went back to get a better picture.
Restart (at West Ruislip, before walking to Ickenham) : 12:13:18, Friday 1 July 2016
Finish : 13:51:32
Elapsed time : 1 hr 38 min 14 sec
Total challenge time so far : 7 hr 43 min 4 sec
Distance travelled on the Underground : 17.22 km
Total challenge distance so far : 88.13 km