The wiring to the CU and pull cord switch is already wired. Im moving the electric shower to the room behind. Plumbing is done and all needs doing is wiring from the switch through the wall to the shower. Im not qualifed but competant in general electrics. Would I be breaking any laws or invalidate home insurance if I did this part if wiring?
No your house your choice. If someone get electric shock and dies while having a shower then you liable. If it's go to court the judge will ask you for qualifications then throw the book at you. As long as your competent then your ok to go.
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Hi, you really do need to be qualified to do this correctly. There are Building Control Regulation issues and well as Health and Safety. The electrical work may cause other issues elsewhere in the installation that could (theoretically) even cause a fire. If you ever had an issue your Insurers would certainly not pay up and even selling your house may become an issue if you cannot provide a Minor Works Certificate for the work.
It's a quick job so fairly cheap to get someone to do it and certify it for you.