Sue and Tim continue to push ahead with their hugely ambitious modernist home in Somerset, committed to showing what is possible on a limited budget. All of their energies now are focused on what should be the stunning centrepiece that transforms their home - an entrance hall staircase - but they only have £2,000 to do it. Piers uncovers an idea at one of Britain's most stunning contemporary interiors, but Sue and Tim must follow a series of low-cost lessons to have a chance of achieving this high-end result with their low-end budget. In north east Scotland, Marcus and Sholto have made some big design changes to their £100k home since we last visited, but also have a fresh problem to solve. The pair fell for the stunning rural landscape, and their outstanding challenge now is to create outbuildings fit to stand alongside their glorious home. With inspiration taken from an extraordinary building on the banks of Loch Doine, Piers comes up with a design which incorporates seating and mirrored panels that could enhance any outdoor space, but can Marcus and Sholto pull it off?