1.   That the prosecutor knew his witness was committing perjury appeared obvious to Dalzell.

2.   The principal witness was too ill to testify.

3.   The witness was composed and sure of her story.

4.   The witnesses were people who worked at the registry office.

5.   Witnesses were asked to stick to the facts and leave aside all emotion and sentiment.

6.   The witness was so exhausted that she might not have lasted out the afternoon in court without fainting.

7.   The lorries always left in the dead of night when there were few witnesses around to record the fact.

8.   Witnesses are unwilling to testify through fear of reprisals.

9.   Witnesses were willing to cooperate.