CPR 11 challenge, fraudulent breach of trust, dishonest assistnce

I am bringing a claim on behalf of the beneficiaries of an offshore trust, some of whom are minors within the UK due to the fraud concerning UK property. One of the defendants is UK-based, one is based in Gibraltar, and 3 are companies registered in St Vincent and the Grenadines, which are administered in Liechtenstein. The three companies have issued a jurisdiction challenge. I need legal representation concerning this matter to begin with. I have been able to get to the point of a 13-page draft skeleton argument which needs to be settled.