You can have our boiler for no.3
Luckily, it’s the boiler in the annexe rather than in the main bit of the house so we still have hot water.
I discovered the problem yesterday evening when I went into the annexe and noticed all the power was off. Isolated the problem as the upstairs ring circuit tripping the main RCD, but took a while to root out the boiler as the cause as it’s downstairs.
Problem is, after a few hours heavy rain yesterday afternoon, it’s impossible to ascertain if the leak is the boiler itself or water coming in from outside. (Some idiot thought it would be a good idea to box in all the pipes.)
Also plenty of rain coming through the conservatory roof but we already knew the felt needs replacing. And our washing machine has been hors service for a while due to a leak - but we’ve got a spare machine in the annexe so have been using that.
I can feel a series of expensive repair bills coming on...