How old is the house? If it's pre 50's there's a chance you don't have a main earth connection which would jack the cost up somewhat.
Old Victorian terrace. It was split into two flats in the 80s though (separately metered, etc) so hopefully should be a bit more up to date.
@aggi started
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How old is the house? If it's pre 50's there's a chance you don't have a main earth connection which would jack the cost up somewhat.