This is a common law offence which means that it does not come under particular legislation. The law surrounding it is from case law rather than legislation by parliament.

If you look at what must be proved that is basically what the law is in relation to this charge.

There is then a lot of case law that explains this law in greater detail.

1. The accused intended to do an act.

2. The act was intended to pervert the course of justice

3. The act did have a tendency to produce that result.

Intent

Factual dispute