過去十年已經出現了越來越多的仲裁，涉及雙方或多方. 所謂複雜的多方當事人仲裁在國際仲裁中提高許多實際問題, 包括但不限於：誰是當事人對仲裁協議的問題, 仲裁協議的“延伸”的可能性, 第三方的合併審理, 訴訟和顯著等實際問題和法律問題的鞏固. 仲裁規則已經適應這些變化迅速. 雖然, 有些問題仍未解決.
該 1998 LCIA Rules had already included the possibility of joining a third party to the proceedings. 這個規則基本上保持在同一 2014 倫敦國際仲裁院規則. 根據第 22(viii) the Tribunal has the power, 經各方或主動申請, to allow one or more persons to be joined as a parties to arbitration provided that that person and the applicant party have consented to such joinder in writing (even against the consent of another party in the arbitration).
然而, 全新的規定已列入 2014 倫敦國際仲裁院規則允許平行訴訟的合併. 根據第 22(ix) and (x), the arbitral tribunal may order, 前倫敦國際仲裁院法庭的批准, the consolidation of the arbitration with one or more arbitrations where (i) all the relevant parties agree in writing; or (ii) no arbitral tribunal has been formed for the other arbitrations (except if it is composed of the same arbitrators) and the arbitrations have been commenced under the same or compatible arbitration agreement(s) between the same disputing parties. 這是倫敦國際仲裁院法院可以決定的條件下，允許, 給予當事人合理的機會陳述自己的意見後，, that two or more arbitrations under the LCIA Rules and commenced under the same arbitration agreement between the same disputing parties are to be consolidated. The LCIA rules allow this even without the consent of the parties (Article 22(x) and prior to the constitution of the Tribunal, 受倫敦國際仲裁院法庭的批准.
對合併有類似的規定也可以在文章中找到 10 的 2012 國際商會仲裁規則, 然而, 相較於其他規則, the consolidation provisions under the LCIA Rules are more cautious than for example the HKIAC Rules, 這讓整合，即使當事人不相同. 精確的效果和影響了這些變化, which may pose problems at the time of the enforcement of an arbitral award before certain State courts, still remain to be seen in practice.
該 2014 倫敦國際仲裁院規則, 含有這些規定, 下面提供.
- 尼娜·揚科維奇, Aceris法SARL