“23. The fact remains that the decision to split what would otherwise be a single trial into more than one trial each dealing with defined issues is a step out of the norm, where in most cases there will be a single trial determining all of the issues arising in an action. Accordingly, there must be a real and substantial advantage if a split trial were ordered to take place. In Bindel v PinkNews Media Group Ltd[2021] EWHC 1868 (QB) ;[2021] 1 WLR 5497 , Nicklin, J said at para. 33: "a case in which the court directs determination of a preliminary issue that will require resolution of disputed issues of fact, including disclosure, witness statements and cross-examination, must be regarded as an exception to the general rule, and one that requires careful consideration by the court and very clear justification." 24.It is also salutary to recall the warning of Lord Neuberger, MR in Rosetti Marketing Ltd v Diamond Sofa Company Ltd[2012] EWCA Civ 1021 ; [2013] 1 All ER (Comm) 308, at para. 1 in connection with the proposal for trials of preliminary issues: "… It represents yet another cautionary tale about the dangers of preliminary issues. In particular, it demonstrates that (i) while often attractive prospectively, the siren song of agreeing or ordering preliminary issues should normally be resisted, (ii) if there are none the less to be preliminary issues, it is vital that the issues themselves, and the agreed facts or assumptions on which they are based, are simply, clearly and precisely formulated, and (iii) once formulated, the issues should be answered in a clear and precise way." 25.Although the present application was not for a trial of preliminary issues, at least nominally, the Master of the Rolls' warning remains relevant where a party applies for specific issues to be determined separately from the majority of issues arising in the action, based on limited evidence and specified assumptions to be made. 26.Unless a split trial can be justified as a means of resolving the disputed issues in action in accordance with the overriding objective with clear benefits over and above those of a single trial, the peril exists that a split trial will add considerably to the parties' costs burden, will delay the conclusion of the action (with an unappealing drain on the Court's resources) and/or will lead to unanticipated difficulties.”