The Civil Procedure (Amendment) Rules 2000

Security for costs other than from the claimant

25.14—(1) The defendant may seek an order against someone other than the claimant, and the court may make an order for security for costs against that person if—

(a) it is satisfied, having regard to all the circumstances of the case, that it is just to make such an order; and

(b) one or more of the conditions in paragraph (2) applies.

(2) The conditions are that the person—

(a) has assigned the right to the claim to the claimant with a view to avoiding the possibility of a costs order being made against him; or

(b) has contributed or agreed to contribute to the claimant’s costs in return for a share of any money or property which the claimant may recover in the proceedings; and

is a person against whom a costs order may be made.

(Rule 48.2 makes provision for costs orders against non-parties)