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BS 476-6:1989+AC:2014Fire propagation6 pieces of 225 (±1.5) mm by 225 (±1.5) mm by thickness (less than 50mm);

andBS 476-7:1997+A1:2014Classification of the surface spread of
flame of products9 pieces of 885 (+0, -5)mm by 270 (+0, -5)mm by thickness (less than 50mm);
Only where specimens are being prepared with a view to
achieving a class 1 standard of performance, 

shall the length of the specimen be reduced to a minimum of 250 mm.