The £6 per year figure is clearly a nonsense if this is £32bn of extra capital spend. Even using a modest financing cost of 4% per year (and it's probably the allowed ROI number that is most appropriate), £36bn would cost £1.4bn a year just on interest before any capital pay back. Divided among 26m households, then that's about £55 per hear. Put a more realistic financing figure in that, allow for maintenance costs on the extra infrastructure and you might double that or more.
Of course business customers will have to be paying their share too, so it won't all be on householders, but the £6 figure is a joke. Maybe a cummulative extra £6 per year, every year for the next decade and a bit.
it would be nice tho think that some of this capital expenditure will go towards efficiency (both energy and operational costs). Most businesses, when assessing investments, also look at that factor. As it is, regulatory regimes often just motivate companies to increase their capital expenditure as they are simply able to make money on this using the allowed ROI rules.