Any suggestions about the garage to house cable?

Is the old house staying up, or is it being demolished ?

You would probably be better applying for a new supply to the new house,
but it will cost you... You should get away with the VAT component though
because its a new build.

Unless you get a seperate supply, you will more than likely have problems
getting the existing supply split and metered seperately (there will only
be one MPAN for the existing supply, and they shouldn`t normally put a
meter at the end of someone elses` submain)

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