Twenty minutes ago he'd told me there had been a further signal from London confirming the last directive.

High above, the destructive alien ship observed what it had done and sent no further signal.

He was trapped neatly, like a rat in a pain corridor, except that here there would be no further signals.

Then he lay awake listening and wondering for a long time, but no further signal came from above.

This then means any further signal is due to the phenomenon being detected and not a systematic error.

A further signal, from a greater distance; then came a whining siren.

At a further signal the men dragged the girl from the arena and a silence descended over the gathered company.

A further signal with a side arm controlled entry to the 'yard' and the road crossing beyond.

This sent out a further signal of Parliament's strong determination to be actively involved in the peace effort.

It seems to me that this is a further negative signal against which this House must react.