With regard to the existing Building Regulations, what is stated regarding alternative escape routes with regard to fire?

Planning and Architecture Part B Fire safety
2

The documentation states that access to an alternative escape route should be via one of the following sources:

	 a protected stairway to an upper storey;

	 a landing located within a protected stairway enclosure which leads to an alternative escape route on the same storey;

	 a protected stairway about 7.5 metres above ground level, separated by some form of fireproof construction.