Ms Mary O'Brien:

The building regulations are B1 to B5 and they are not prescriptive. Under them, internal fire sprays and a means of escape shall be provided to a building. TGD B provides prescriptive guidance on how to achieve prima faciecompliance with the building regulations. This is why a great deal of reliance is laid on TGD B in the design of these buildings – it provides prima faciecompliance with the regulations.