Replacing 2 gang dimmer with WiFiPlug Glass switch wiring question

[LeapofDeath]

Hi all, I have a small outbuilding with interior and exterior lights controlled from inside by a 2 gang dimmer switch. I want to replace this switch with a WiFiPlug Glass one (pictured), so that the lights can be controlled from the house. However I'm a little confused by the way the current switch is wired (also pictured) - any advice on how to fit the new switch would be gratefully received!

Attached pics are of my current switch, the back of the new switch showing terminals and the wiring diagram for the new switch.

 

[The Ghost]

can you show the back of the existing dimmer switch?

 

[Taylortwocities]

 

[Octopus]

Hum.... My crystal ball sees this going wrong!