The wiring of Nest is the easy bit, the connections are well labelled so not a problem. However once wired up I seem to be having problem after problem, once I find the cure, it seems easy, but it has so many options, all too easy to select the wrong one. First problem was no hot water control, seems I selected wrong boiler type, seems my boiler type is "Other" not very helpful, OK know what a Combi is, but system? Once got hot water to show, I set the schedule with PC, nothing, seems I had to enable schedule with the thermostat. Then found not following the set schedule, I set 7:00 am to 7:30 am every other day, so Mon, Wed, Fri, Sun however on Tuesday at 7:15 am realised the boiler was running, checked both PC and thermostat, both said boiler not running i.e. no orange anything, and the history showed nothing, switching off power to thermostat and boiler clearly stopped it running, and one could hear the relay click, turn back on, and to start with nothing, as expected, then click relay operated and boiler running again, tried all I could think to turn it off, but since software did not show it running, it would not turn off, finally after 8 am seemed to behave again. The help option on internet told me to turn off far reach and disable the DHW schedule, yes it stopped boiler coming on, both when it should not come on, and when it should come on. It does not help that one keeps ending up with Nest US help instead of UK even when very careful to select UK. But in the "Learn about domestic hot water" I found It would seem the default was still active, even though on the PC it said 7:00 am to 7:30 am on 4 of the 7 days, seems the heat link had failed to read this, and was heating as the default is set, which would explain why after 8 am it switched off. I have checked on the thermostat, and that now shows same schedule as the PC, but don't know if that was case on Tuesday when it last run when not scheduled to run. There are loads of U-tube videos, but in the main about US Nest not UK, so one starts to watch then find it's connected to a furnace not a boiler, and does not have a heat link. So is there any help pages on how to set up Nest where it actually uses proper UK English?