Profile: Tasha Chandler, Phil Snowden and Louisa Brown

This month's letters consider the role of professional oversight, the risks of fracking, potential changes to Building Regulations and product testing in the aftermath of the Grenfell Tower fire, and also provide further details on the Comet aircraft failures of the 1950s.

Peter Sparkes provides some background to the recent article on the strengthening of the Hammersmith Flyover, describing the investigations that triggered the strengthening programme.

As head of sustainability across Ramboll's building structures division, Brogan MacDonald has made impressive progress in her short career so far. A year into the role, she talks to Helena Russell about how she got here, where she's going, and the importance of positive role models.