That will not work. That is an on/off switch that turns on and off the line and neutral connections. That is what double pole means.
to do what you want, you need a DOUBLE POLE , CHANGEOVER switch.
This is the connections for the M2 Gridswitch
picture came from.the connections for the M2 Gridswitch
Looks like this time You were right, and it was CEF and us that had it wrong.Hmm, I hate to say this but (this time) you may be right.
From the M2 websiteYes, that's the same as the CEF listing I was working from: only the front shown.
I don't know where picture came from.
From the M2 website
http://www.m2electrical.co.uk/index.php/20a-dp-grid-module-2-way-switch-brushed-stainless-steel.html
There Intermediate switch oddly is shown as
http://www.m2electrical.co.uk/index...ermediate-switch-brushed-stainless-steel.html