Architect Sir Terry Farrell explains why architects are uniquely placed to solve the problems of Britain's public spaces - and why doing the work for free is crucial to its success.

Sir Terry explains how working pro bono can bring together businesses, councils and community groups who would otherwise find it hard to work together, and how these architectural schemes or 'masterplans' can transform the public spaces we all share.

He describes some of the schemes he has worked on - and how, even though it sometimes takes years, the benefits are clear to see.

Producer: Giles Edwards.