It has four permanent impacts upon the individuals subjected to it:

In children, even mild lead poisoning can have a permanent impact on attention and IQ.

But for art to have a permanent impact, he said, it must be taught with an academic strategy.

"This calls into question whether sanctions have had any permanent impact."

The judge said that temporary non chronic impairments, "with little or no long term or permanent impact - are not disabilities."

The Conservative government passed legislation banning such strikes, and there was little permanent impact one way or the other.

"But there is a backlash if there is no permanent impact on supplies," he said, explaining yesterday's price drop.

They can have a devastating and sometimes permanent impact on your health.

He was causing trouble out of all proportion to his numbers but what he was doing was unlikely to have any permanent impact.

He made no progress and did not make a permanent impact.