When you have to make a witness statement for court
at the trial: The trial takes place after all of the preparation been completed. All of the parties, their witnesses, their experts (if any) come to court for the dispute to be heard and decided by the judge.
At the trial, the witness statements prepared for the trial will almost always include "lay witness statements" (lay evidence). Lay evidence is just evidence which is not expert evidence.
Expert evidence is given in the form of witness statements by people specially qualified to assist the court decide technical issues. Experts in a case could include IT experts, doctors, engineers, quantity surveyors or mechanics. They are qualified to give opinions in the areas of their expertise.
