Had a boiler overpressure issue, 1.2 raising to 2.6 when COLD over 2-3 days at which point it starts to leak internally. 1st engineer disconnected filling loop and there was a steady drip. Now I'm no plumber but if water is leaking past the filling loop taps when the taps are closed then it's not doing it's job. YET they DID NOT replace the loop/valves. they've been 3 times now to fit Schrader valve, heat exchanger and some black plastic thing the engineer said could have gone BUT NOT the loop/valves. Got them coming out for a 4th time as we now have a leak internally ALL the time (bucket underneath) coming from... *drumroll* ...the filling loop connection! I'm actually happy as this just proves the mains pressure is getting past the valves, let's hope the next engineer just swaps them out. I've had no issues getting a slot quickly so have to give 2 starts for that, if they had fixed the issue first time 5 but a bit annoyed that in 3 visits the obvious issue isn't being considered/resolved. I'm just so glad I've got Homecare Cover as it would have cost a small fortune otherwise.