Power shower isolator PSU gone kaput (I think)

[Avo Mk8]

I,ve ruled out the fuse and have no idea which circuit breaker it is on. Always play it safe and turn all off unfortunately. Learnt the fan is connected to the isolator which I didn't know so thank you for that

I would have expected mains from the consumer unit to come through to the fused switch, and then the switched side of that go to the shower. Maybe it was wired differently. Someone with a tester would be able to see what is going on.
If you have a multimeter and know how to use it, you may be able to do continuity checks with the power off to see why the shower is not working as it used to. Otherwise get an electrician in!

 

[Paulomor]

I would have expected mains from the consumer unit to come through to the fused switch, and then the switched side of that go to the shower. Maybe it was wired differently. Someone with a tester would be able to see what is going on.
If you have a multimeter and know how to use it, you may be able to do continuity checks with the power off to see why the shower is not working as it used to. Otherwise get an electrician in!

Will do and thanks again for the advice