Over Yom Tob, I noticed something I consider odd in both the Gaon and the De Sola Pool machzorim for Festivals. The headers on the services for The Sabbath of the Intermediate Days read, in Hebrew, as לחול המועד ושבת. I would ordinarily expect the phrase to be לשבת חול המועד. Is this a particular S&P idiom? Or a particularity of the British S&P community?