I know it’s generally assumed to be Les soeurs heureuses, but this is radio, after all, so no one’s seen it written down. Then there’s Ambridge’s scattergun approach to pronunciation - they can’t even manage to be consistent in English, never mind furrin. So…
Les heures heureuses - never mind the food, just get pissed on the cheap Lezzers’R’Us - (aka ‘“Les Soeurs” yer arse!’) would finally put an end to a demand from certain quarters that has been repeated ad nauseam since the days of the original BBC boards.