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off a website.
so does the boiler need live, neutral,earth and 2 more cores or does its just need sw live from 15 in wiring centre,neutral,earth and then leave link in 1 and 2?
If it is from a random website and not from the boiler manufacturer then of course it isn't going to be correct for the specific boiler you are wiring.
It isn't even correct for the setup it shows.
The boiler needs a permanent supply, usually from a switched fused spur with a 3A fuse.
The boiler needs a signal from the external controls, this must be connected between terminals 1 and 2.
Terminal 2 is a 230V outgoing supply from the boiler to the external controls, terminal 1 is for a 230V switched live from the external controls.
The switched live at terminal 1 must come from the supply from terminal 2, this ensures that if the boilers internal fuse operates it cuts power to all parts of the boiler.
You can either connect terminals 1 and 2 to a volt-free output from the external controls or you can use terminal 2 to supply power to all of the external controls.