 Cadogan Estates offered the RPO the use of the hall as its principal venue in late 2001.The RPO gave its first concert as the resident ensemble of Cadogan Hall in November 2004.Since 2005, Cadogan Hall has also served as the venue for The Proms' chamber music concerts during Monday lunchtimes and Proms Saturday matinees; it is also one of the two main London venues of the Orpheus Sinfonia.