Viewpoint: A century of progress: the Women's Engineering Society at 100

This month's letters include the answer to a two-year-old mystery wall query and the Venezuela earthquake and the role of no-fines concrete.

The building control regime in Scotland provides a level of rigour that Victoria Tinney finds reassuring; two years since establishing her own practice in Glasgow, she talks to Helena Russell about the Scottish building warrant system and the power of sketching.

This month's letters discuss foundations in shrinkable ground and highlight a survey on structural optimisation in practice.