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Great observation and photo!
Thanks, there were actually 3 of the woodlice all together and surprisingly they did not run away, they just wandered(quickly) round in circles and came back to where they had started from. Previously when I've found this species of woodlouse its vanished almost immediately.
How did you spot them - were they inside the ants' nest?
I lifted up a small bit of concrete, took the photos and put it back a few moments later. The area has lots of bits of rubble, there were other types of ants under other bits of concrete or bricks.
Lat/Lng: 51.959, -0.638698
OS grid ref: SP936298