In honour of the sun and the heatwave it’s brought this summer, here’s the giant “equinoctial” sundial on the north bank of the Thames, just east of Tower Bridge. Known as Timepiece, it is the work of London-based sculptor Wendy Taylor and was installed here, beside the lock that leads into St Katharine Docks, in 1973. Measuring more than 3.5 metres across, the dial is made from stainless steel and is supported by three chunky chain link cables. According to the plaque, it was commissioned by Strand Hotels Ltd. It’s now a Grade II-listed structure.