This is my 1st dip into "smart" stuff.
Existing setup = One way dimmer for main bedroom light.
Smart setup = Smart switch with manual dimmer capabilities (to keep wife happy!)
I switched the electric off this afternoon and wired in my new Shelly Dimmer 2 to my bedroom light. Linked to Google a/c and could turn light on/off and dim via Google mini
But the manual dimmer switch didn't work, only on or off 
Here are the pictures of existing switch and what I tested with. All wiring was just temporarily and is back to original now as there is a noggin behind the light switch which stopped me installing a deeper backbox to accomdate the Shelly!
I bought a Varilight 2-way and off retractive switch from Screwfix and wired L1 to SW1 and L2 to SW2 (Switch to Shelly).
Existing setup = One way dimmer for main bedroom light.
Smart setup = Smart switch with manual dimmer capabilities (to keep wife happy!)
I switched the electric off this afternoon and wired in my new Shelly Dimmer 2 to my bedroom light. Linked to Google a/c and could turn light on/off and dim via Google mini


Here are the pictures of existing switch and what I tested with. All wiring was just temporarily and is back to original now as there is a noggin behind the light switch which stopped me installing a deeper backbox to accomdate the Shelly!
I bought a Varilight 2-way and off retractive switch from Screwfix and wired L1 to SW1 and L2 to SW2 (Switch to Shelly).