Remove existing (defunct) 6KW shower unit. Install 10KW (already sourced) 10 KW shower.
The 10A cable has beeen layed next to the existing 6A cable. The 6A cable need disconnecting from the main fuse (Micro circuit breakers) panel and the 10 AMP needs installing instead. The fuse (circuit breaker) seems to be rated 10A so should not need changing.
The existing cold water feed should be re-used but may need a small amount of pipe adjustment to match up with the new shower's requirement.
There is no need for making good - the owner is happy to complete any necessary #making good' within reason
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