I have a 2015 Insignia SRI diesel estate and there is no fuse box in the boot like I had in my old 2010 Diesel EcoFlex model. I need to find the fuse for the alarm as it keeps going off when left in the sun, anyone know where this can be found? 
All manuals stat it’s fuse 22 in the rear fuse box, and it’s not found anywhere else. 

I believe fuse 22 should be under the dashboard area?

There’s no fuse 22 in the glovebox compartment, it’s an empty ignition fuse. It should be 22 in the missing luggage fuse box 🤷🏻‍♂️

I don't know whether pulling the fuse it sufficient as there is probably a backup battery in the alarm siren.

Maybe use a sunscreen to block out much of the heat/UV entering through the screen.

Mind you I can't remember the last time I saw the sun in Dorset this year 🙂

Good idea, I’ll grab a sunscreen. Leaving the window slightly open helps as well. Apparently the hot air in the cabin sets off the motion sensor setting off the alarm which sounds somewhat bizarre. 
turning off the internal sensor only works for a short time 🤦🏻‍♂️🤷🏻‍♂️