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Am I missing something here as I thought this was a site for help and assistance rather than criticism and sarcastic comments. Just to let you all know I did get a professional in and he admitted he had never seen such wiring set up. It took him nearly four hours to fix the issue but did...

Stem, I took the LP522 off thinking it looked straight forward and wired the Nest thinking it was a combi boiler from the Nest manual (my mistake I know assuming it was a standard combi boiler). The Nest thermostat and heat link can see each other and when you press the button on the heat link...

It is definitely a Baxi Megaflow yes. Sorry yes I should be saying blue instead of neutral and brown instead of live. The nest works in that it turns the boiler on but it doesn't turn the heating or water on but its only wired as a 230V combi boiler. Appreciate the comments but you are right...

I have to be honest I don't know heating systems but electrics yes. I have the boiler in the kitchen down stairs and a hot water cylinder tank upstairs. Both heating and water being controlled by the LP522. I currently have no heating but I can manually switch the water on by the manual override...

The only cable going to my Drayton LP522 controller for the heating and water were the power from the spur unit, the four core flex from the boiler as described and the four core cable (only three cores used) from the room thermostat.

Can anyone help in how to wire the Nest Thermostat. I have a Baxi Megaflow combi boiler with a hot water cylinder tank on my top floor. The only connections I have on the boiler is a four core cable going to Live, Neutral, Earth and Switch Live. I then obviously have my spur output Live...