Spotted yesterday by a reader, Huw, on the steps that lead down from Elizabeth Bay Road to Rushcutters Bay Park.

We always like to keep up to date with our alphabet riddler.

For a moment we worried the chalk graffiti around the neighbourhood would stop when we put two and two together -i.e. when someone tipped us off (though we could have googled at any time) – and discovered the alphabetical riddler.

Fortunately, we needn’t have worried. This one – U is for “Unlikely” – is on Little Surrey Street, Darlinghurst, across from the Victor Chang cardiac research institute.