Window Guarding - Sill is circa 700 above floor

[NorthernNewbie]

Hi,

 

First post so please be nice. 

 

Doing a house refurb and had new escape windows put in but the BI has told me I'll need to pop a guard on.

 

Has anyone had any experience of this? What sort of guard should I look at and where from?

I noticed someone had mentioned popping a unlockable catch on the window but I'm not sure that would pass.

 

Struggling to find a guarding solution.

 

Any help welcome. Thanks in advance. 

[DevilDamo]

https://www.nhbc.co.uk/binaries/content/assets/nhbc/tech-guidance/glazing-guarding-and-restrictors-in-dwellings.pdf