O
Octopus
Hi,
When off (isolated) there is no supply at the fan end at all.
All wires are dead.
Switch Info
Bottom
switch L1 (Brown is live)
switch L2 (Grey is dead)
switch N (Black is dead)
Top
switch L1 (Brown is dead)
switch L2 (Grey is dead)
switch N (Black is dead)
When on (not isolated) the brown is live, grey and black dead.
Switch Info
Bottom
switch L1 (Brown is live)
switch L2 (Grey is dead)
switch N (Black is dead)
Top
switch L1 (Brown is live)
switch L2 (Grey is dead)
switch N (Black is dead)
My final bit of advice
Get your wallet out!