Howard Panter and Rosemary Squire: 'People always say British theatre is the best. We must protect it'

The most powerful couple in UK theatre, Howard Panter and Rosemary Squire will open two significant projects on opposite sides of the world this year – Theatre Royal Sydney and Trafalgar Theatre in the West End. They tell Theo Bosanquet why they’re remaining optimistic about the future of the industry and broach the thorny issue of insurance