IMM wrote


This 4 metres. Is it toi the sill, teh catch, the top of the window?

From the Regs:

CLEANING OF WINDOWS AND ROOFLIGHTS
P2.3* In a building of purpose group 1, any window or part of a window more than
4 m above the adjacent ground must be constructed so that its external and
internal glazed surfaces can be safely cleaned from
a. inside the building; or

b. from a loadbearing surface; or

c. a window access system mounted on the building,

except -a window in any part of a building in common occupation which
complies with the standard in P2.4b.