Their reissues are always pricy. Limited editions using vintage gear.
From their website: "For mono masters, the engineers have deployed vintage Danish Lyrec valve reel-to-reel tape recorders and Ortofon valve cutting lathes – machines actually designed to work synergistically by the same exacting manufacturers (Ortofon’s renowned Dr. Schlegel was the pioneer of the moving coil cutterhead – a major advancement in mastering technology that dates from the close of the Second World War – and the company remains the industry leader in valve record-cutting technology after more than 60 years spent manufacturing the specialist mastering engineer’s lathe of choice). Stereo masters also use vintage Neumann and Lyrec valve lathes in tandem with another technological rarity, the hefty EMI BTR2 reel-to-reel valve tape recorder, a wonderful, robust machine so revered in mastering circles that even EMI’s deadly rivals, Decca, once swore by it, as did the BBC, IBC and others, including, naturally, EMI’s own Abbey Road facility."