Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.
^^ connecting both elements to a 16 A mcb would not trip an RCD .. unless damage to the cables occurs
How do the "disconnected" cable cores look?
On older installations the heat from the immersion & tank will make the insulation deteriorate and...
Why didn't you call the 1st plumber back?
extremely unlikely to be the programmer ... leaking MV would be the best place to start IME
That depends on what the 3 months consumption says
How long have you been in this flat?
Historic bills would show consumption over time .. and whether they were using estimated or actual readings
Out of interest how many of your “old” bills have you got ?
Did you re pair it to the base station?
Have you tried replacing the batteries?
The supplier can not force one on you ..
That sounds cheap .. even adding on VAT ... and architects don’t have a clue about the finer details beyond placing symbols on a set of...
Out of interest what’s your budget for the electrics and the necessary fire alarm control system?
How did you come up with £8k without consulting anyone?
Out of interest why would you want one?
Separate names with a comma.