In Monmouthshire, on the Bristol Channel, a 100-year-old lighthouse is the venue for Simon and his team's latest project. After running it as a B&B business for many years, Danielle and Frank have decided they now want their home back but don't want to give up the hospitality business completely. They want Simon's help to convert a disused building that formerly housed a floatation tank room, but on inspection, Simon deems it structurally unsound.