hi, been asked to do a small job for a customer, im puttin a light inside his shower but instead of having the light switching with other lights in the bathroom he wants it switching when he pulls the pullcord for the shower... to do this i was going to break into the cable going from the pullcord to the shower with henley block then out to a fused spur, from ther with a bit of 1mm cable fused at 3amp to the light, does this sound ok?