Managed to find all the parts.

2014-05-18 09.57.52.jpg

I got the size wrong is a 1kg powder extinguisher and it weighs 250g as it stands with nothing attached.

I am not sure what kind of flow controller I have, but I do need to change the solenoid as it is 230V AC at the moment.

Also discovered I have 2 brand new and unused GR01's. Not a bad find.

One possible layout...

2014-05-18 10.04.23.jpg