Quite right. I've just rewired a friends house in Sheffield and their
off peak is an absolute bargain but the YEB say they can't get that
tarriff now. If they stay as they are they can keep it but if they
want the meter or any related equipment changing they'll have to stick
it on the more expensive tarriff.

I don`t think they can force a tariff change just because they want to -
if any equipment needs replacing (including the cutout / meter) the
tariff stays as-is AFAIK. At the end of the day, tariffs are usually*
just different figures applied to the same meter reading(s).

* certainly at the small consumer end of the market - larger
installations where half-hourly readings come into play would be a
completely different kettle of fish :-p

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