The test was held this weekend, taking advantage of the full moon, and has been hailed a success by archaeologists according to the Beeb:
About 200 volunteers stood on the summit of 10 hillforts in north Wales, the Wirral and Cheshire, and signalled to each other with torches.
Their aim was to learn if communities used the summits to warn each other.
"It was a success," said archaeologist Erin Robinson. "It captured the public's imagination and we made extra links we did not think were possible."
There's another, shorter article here.