“15. It is clear that the Tribunal has the power, under Rule 5(3)(j) of theTribunal Procedure (First-tier Tribunal) (Tax Chamber) Rules 2009 , to direct a stay of proceedings. 16. There was broad agreement that the proper approach to be adopted by the Tribunal in a stay application such as the present was that confirmed by Lord Osborne, delivering the opinion of the Court of Session (Inner House), in HMRC v RBS Deutschland Holdings GmbH[2007] STC 814 who said, at [22]: “… As we would see it, a tribunal or court might sist [stay] proceedings against the wish of a party if it considered that a decision of another court would be of material assistance in resolving the issues before the tribunal or court in question and that it was expedient to do so”. 17. Such an approach has been adopted by this Tribunal eg in Coast Telecom Ltd v HMRC[2012] UKFTT 307 (TC) in which Judge Berner observed, at [21], that the “question is not whether the determination of another court might provide assistance, but whether it will provide material assistance”