Roland Perry wrote:

Andy Burns wrote:

A window that can be locked, and the key removed still meets the
requirement of an "escape window" providing it it large enough and can
be retained open without being needing to be held.

Finding it hard to parse that. Are you saying an escape window can be
locked closed, and the key discarded, meaning it's no longer possible to
use it for escaping?

yes.

Building regs, document B1, Section 2.10