all clear

But she added that she would like to see intermediate-term metrics improve before waving the all clear.

The second delay came after Ms Loughman received a message from police saying the trial was "all clear" to go ahead, only for the case to be withdrawn again eight hours later with no explanation.

On the night of the escape, November 14, the diggers got the “all clear” signal from the farmhouse.

"That said, today's data were not so soft that the Committee can sound the all clear," they added.

Already today there have been three bomb threats on other services, forcing staff to evacuate the trains until explosives experts have given the all clear.