On 24/04/2021 12:48, GB wrote:

I was recently helping my son in law get his flat ready to sell, and I
noticed that the Critall metal windows have unusual hinges, like in the
photo.Â* These are similar to parliament hinges.

https://www.deltaglazing.co.uk/wp-co...ow-repairs.jpg


The effect is that, with the window open there's a gap at the hinge side
that's wide enough to get your arm through for cleaning the outside of
the window.

That's such a simple idea, and so easy to implement that I'm surprised
it's not more commonplace.

They look identical to those in my old house, built in 1947.

Bill