Technical Booklet H Stairs Ramps Guarding and Protection from Impact·Page 33·3.40
Handrail Extension at Change of Level
Handrails must extend horizontally at least 300 mm along top and bottom landings to warn of level changes, be closed at the end, and not project into routes of travel or catch clothing.
To give warning of a change in level i.e. the start or finish of a flight, each end of a handrail should extend horizontally for a distance of not less than 300 mm, along the top and bottom landings of a stair, be closed and terminate in a suitable way so that – (a) it does not project into a route of travel; and (b) it reduces the risk of clothing being caught.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet H - Stairs Ramps Guarding and Protection from Impact.pdf