Lamona HJA8630 part

Hi all
I have a Howdens Dishwasher HJA8630. to sort,
I sussed out that the on/off switch was faulty. so I have temporarily shorted out the neutral side of the switch just to give the customer some service.
A couple of questions if you can help.

While shorting out the neutral side I would have expected the switch to still operate as normal (ie breaking the live side) however this is not the case the machine still operates as if I had bypassed the whole switch does anyone know why?

There is a tube attached to the switch but I don’t know what it’s function is. I am just guessing that it is attached to some kind of flood protection device which switches the power off in an emergency. Any ideas?

Lastly can anyone tell me where I can by one of these switches, a search in the forum suggests the AWS should be my answer however on going to their site it seems a lot of the links don’t seem to work. I don’t really want to wait until Tuesday to phone them up.

Regards to All
David