tariffs

if bulb is only one tariff, when i look them up and put my post code in, why is it giving me a lower tariff to the one im paying now

if bulb is only one tariff, when i look them up and put my post code in, why is it giving me a lower tariff to the one im paying now

It’s one tariff, but costs vary per area within that tariff. This is the same for all suppliers, their costs vary by area.

Those different prices are not classed as a different tariff, because there’s no way for you to choose what to pay other than moving house to a different area.