(1) The overarching obligations apply to—
(a) any person who is a party;
(b) any legal practitioner or other representative acting for or on behalf of a party;
(c) any law practice acting for or on behalf of a party;
(d) any person who provides financial assistance or other assistance to any party in so far as that person exercises any direct control, indirect control or any influence over the conduct of the civil proceeding or of a party in respect of that civil proceeding, including, but not limited to—
(i) an insurer;
(ii) a provider of funding or financial support, including any litigation funder.
(2) Subject to subsection (3), the overarching obligations do not apply to any witness in a civil proceeding.
(3) The overarching obligations (other than the overarching obligations specified in sections 18, 19, 22 and 26) apply to any expert witness in a civil proceeding.
(4) Subsection (3) is in addition to, and not in derogation of, any existing duties applying to expert witnesses.