Joining a party as Defendant to an action I am a litigant in person with very limited resource and not enough disposable income to pay for legal counsel. I am being sued in the High Court by an unscrupulous multi-national for whom I used to work and I find myself at a disadvantage due to my lack of knowledge pertaining to proper High Court procedures. The claim relates to a loss ocassioned by one part of the multi-national group (A) ocassioned by a breach of contractual undertaking to a client by another part of the multi-national group (B). (A) is now suing me for acts that occured long after the breach by (B). In an attempt to recover its losses from an external source, rather than from its sister company (B), the claim disingenuously alleges that my subsequent acts caused the loss. Moreover, (A) has dishonestly attempted to conceal the contractual undertaking of (B) and has not referred to it in its Statement of Claim against me. I have subsequently discovered the existence of the undertaking, the breach of which was the true cause of the loss sustained by (A). I would now like to apply to the Court for an order under CPR 19.4 to have (B) added as a Defendant to the proceedings on the basis that clear evidence exists that (B) was the true cause of the loss for which I am now being sued. In the alternative, I would like to apply to the Court for the case to be struck out on the basis that it is an abuse of the Court's process. However, I have no idea how to make a proper application to the High Court for such an Order and I am afraid that, notwithstanding the merits of the application, that it may fail for improper adherence to the proper process. Any advice would be gratefully received.