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Awful, but the lesson here is true, I would be very reluctant to mess with other people's wiring, and never in a rental or council property. The shower was simple enough, but as I said,  the plumber, quite rightly wanted the electrics signed off before he would commission the shower. If I'd...

On the contrary,  perfectly happy with the professional attitude and advice given. I fully accept his charges, and apparently testing is roughly twice as much as it would be to install it himself, fair play I reckon. I can do this installation,  it's easy, but if it's not done right and...

So plumber won't plumb shower in without electric sorted, shower warranty not valid with DIY install. What did tickle me was the electrician charging twice as much to sign off electrics that I fit as it costs for him to do. Clever.

Exactly,  something like this looks ideal, it's worth it to protect the shower circuit properly. Mike.

I know what diy'ers are like. I tried removing a bar heater without isolating it properly, but that's another story. There is an electrical wholesalers near me that are really helpful, so I'll be sure to ask them. B an Q don't really have people on hand, it was posted as an example!! The spur...

So the existing circuit up to the switch will be kept, save for insertion of RCD and the current cable after switch currently passing via transformer to shower will be replaced by twin core and earth rated to at least 6amp. Mike

Yes, there is a switch already in the circuit now with a replaceable 3 amp fuse. It will be reused. Does this RCD thing need to be between switch and shower or spur and switch? I assume before the fused switch.

http://www.diy.com/departments/wylex-63a-sp-230v-30ma-shower-protection-unit-rcd/177830_BQ.prd this kind of thing, on the actual spur.

Good advice on here,  really appreciate it all. From the sounds of it, it's pretty straightforward and should not be out of my abilities.  It won't overload the existing wiring as it's running a 3amp maximum rating which is fused. Or at least will be.

Erm yeah that thing.

New unit recommends a spur fused separately at 3amps, it's hot and cold water feed so no internal heating elements!!  It recommend a 30ma mcb in circuit or at the consumer board - I shall put one in spur. The spur is already there - serving exist unit - so just need to run new cable from...

Sorry, bit confusing I know. The existing shower is a power shower but it runs on 24 volts via a step down transformer outside the room. A switch outside isolates it. The power comes from a spur off the ringmain. I though I would replace the existing switch with a built in mcb type thing but...

So, some background. The house is 1978 ish build, brick and tile. It's never been rewired. The old wire fuses are all plug in mcb's except one which I can't identify and is either a direct connection to the immersion circuit that isn't working or the feed to the old bar heater I took out...

So a quick intro before I go with some questions!!  I'm not an electrician,  but I do have some idea of what I'm doing!!  essentially I'm self taught,  although did start an electronic apprenticeship that fell through. My dad is an electrician so taught me a lot of pre part p reg wiring work...