https://www.slab.org.uk/guidance/statements-in-multiple-accused-cases/
https://www.slab.org.uk/guidance/statements-in-multiple-accused-cases/
In cases involving more than one accused, where possible you should avoid taking multiple statements from material civilian witnesses unless this is absolutely essential in the interests of justice and of the accused.
You should liaise with other solicitors to ensure that they do not take statements from a witness unnecessarily.
Similarly, solicitors should liaise where they are taking statements from the Police, HM Revenue and Customs or Scottish Drug Enforcement Agency officers giving generic advice not directed at a single accused person.