Pressure placed on witnesses
The linked story is from the Sunday Telegraph and involves social workers in Northumberland pressurising witnesses in Fran Lyon's case. What is unique abount this attempt to pervert the course of justice is that it has been done in a case which is essentially public.
The "culture of consequentialism" means that the ends justify the means. The objective of the local authority is to get the baby. Therefore what is done to achieve this objective is not material as long as they get the baby.
It shocks people when they end up in the Kafkaesque world of the Family Courts. Generally things in the UK do not work this way. However, as a result of the secrecy of the court processes bad practice becomes endemic. This is why people start out really bewildered by the irrational way that the system behaves.
Another thing that happens frequently is presenting people with the need to prove their innocence. It is suggested that something is possible (without any evidence to prove that it is true) participants are than required to prove that it is not true.
That is actually rather difficult even for people who are totally innocent of the allegation. However, if evidence was required for allegations then it would mean people would make less money.
Another variant on this is to keep these allegations out of the formal discussions and merely use them to put pressure on witnesses. That makes it impossible to deal with the allegations because people under investigation don't know what they are.