Verulam (readers' letters – December 2014)

Ali Mahdi finds this book on steel and steel-composite bridges to be a useful source of information for students – both undergraduate and postgraduate – with something for the practising structural engineer too.

Charles Goodchild considers this book an admirable attempt to do justice to a vast and fluid subject. While not covering every nuance, it will be of great benefit to both postgraduate students and practising engineers.

It's easy to overlook existing buildings when considering how to achieve a zero-carbon economy. Rolton Group's Chris Evans stresses the need for a holistic approach to energy efficiency in the UK's current building stock.