The orchid Cattleya Britannia is a hybrid registered with the Royal Horticultural Society by Sanders[St Albans] in 1903.
Top three species ancestors and their influences are

• Cattleya warscewiczii (50.00%)  subgenus Cattleya  section: Cattleya 
• Cattleya mossiae (25.00%)  subgenus Cattleya  section: Cattleya 
• Cattleya purpurata (25.00%)  subgenus Crispae  section: Crispae   series: Cattleyodes