At the Denton Corker Marshall-designed Stonehenge visitor centre, there’s nothing neolithic about the state-of-the-art washrooms – although monolithic definitely comes into it. Stockport washroom solutions company Lovair supplied and installed it, charged with building  two 3.2m long Corian sink troughs weighing nearly 100kg each, and designed to give the impression of floating.  To do it Lovair had to get all Iron Age, designing a bespoke metal structure support frame that allowed the sinks to cantilever fully off the back wall without interfering with the under floor heating below – a modern-day trick that counter points the monument’s trabeated, primal form.