Citizens Advice had stressed the need for witnesses to have the right support and options for giving evidence in order to ensure an effective justice system.
The charity, which runs the Witness Service helping 14,000 people a month give evidence, recognised the pivotal role witnesses play in the justice system.
The HM Crown Prosecution Service Inspectorate have published a review into how witness summons are used by the Crown Prosecution Service.
Citizens Advice Chief Executive Gillian Guy said:
“Courts are an alien environment for most people. Witnesses can feel isolated or frightened at the prospect of going to court which is why they need help and guidance to understand the processes and how their contribution can secure justice.
“Summons without support means people aren’t given the information they need to give their best evidence and can find the prospect of going to court daunting.
“The right support and advice can equip people to confidently give evidence. With four in five people supported by the Witness Service reporting they feel less anxious and distressed and better able to cope with giving evidence, it is clear that having empowered witnesses is pivotal to an effective justice system.
“As well as directing people to the help available, the Crown Prosecution Service needs to make sure vulnerable and intimidated witnesses are offered the choice to appear via video or behind a screen and that it is actually available on the day. This is particularly important in domestic abuse cases when the witness may also be the victim.”