viola will begin filming in London , France and Bahamas in the autumn . Saunders spurred on to write script after £ 10,000 bet with Dawn actors . 56-year - old , who plays viola , told producer he wanted to ' do it before we die '
Cast will become filming in London , France and Bahamas in the autumn . Saunders spurred on to write script after £10,000 bet with Dawn French . 56-year-old , who plays Edina , said Joanna Lumley wanted to 'do it before we die '