Advice needed on electric bills - Npower

macman

So you are saying that there are two consumer units (fuse boxes), each with several circuits on it? But for example the shower and the oven are on separate circuits, even though on the same consumer unit (there will be several circuits from each consumer unit). If so, that's OK-no need to panic.
A picture of the C.U's might help to clarify.
Sounds to me as if you have a fault on 1 circuit which is tripping an RCD on that consumer unit. Which CU is it, and what circuits are marked as coming from it?

PNPSUKNET

does sound like an over load on the loop, inregards to the psot about cost we pay £80 total for gas / elec, do you keep your imersion heater on all day?