The BBC’s big new dating show has turned into a nightmare for bosses after collapsing in the ratings – despite costing a staggering £5million to make. Hosted by Davina McCall, Stranded On Honeymoon Island, which was billed as the Beeb’s answer to Love Island, launched last Wednesday on BBC One but pulled in just 848,000 viewers. That was only marginally ahead of a documentary about Nazi U-boats airing on BBC Two at the same time. To make matters worse, Davina’s Long Lost Family over on ITV attracted more than double the audience in the same slot. By its third episode...