Sept 17: Business model proves long-sighted

Mary Perkins co-founded Specsavers with her husband in Guernsey in 1984 after they had moved to the island to retire. Almost 25 years later the company is the biggest privately owner optical retailer in the world. Mrs Perkins explains to Bob Sherwood why their joint venture business model has worked so well and how they are now replicating that model for other products and outlets around the world.