Following their 1–0 win over long-time rivals Lancing Old Boys in the 2015 Arthur Dunn Cup Final, the Old Carthusians made Arthurian League history by finally winning the 'Treble-Double' – winning the Arthurian League Premier Division and the Arthur Dunn Cup in the same year for three successive years. The 'Treble-Double' had only been achieved by one team before – Lancing Old Boys in the 1980s. The Old Carthusians, however, added an additional trophy to the traditional 'Double' in each such year by also winning the Jim Dixson Trophy, meaning that the Old Carthusians had eclipsed the Lancing Old Boys team of the 1980s and achieved the unique accolade of having won the 'Treble-Treble'.