CH wiring

IMHO, you should remove and discard the existing flex from the SFCU to the boiler.

You should be taking a new 3-core flex (L,N,E) from the SFCU to the wiring centre and a new four core flex (L,SL,N,E) from the wiring centre to the boiler.

Apart from that, your wiring diagram seems to be consistent with the Sundial general schema.

The only thing slightly confusing thing is that you've shown the Heatmiser receiver with NO/NC contacts, but the contacts are in the energised position and they should be shown in the un-energised position.

HTH

Ah, right - makes more sense.

I guess I was thrown off track by the diagrams in the wiki all showing the boiler only getting live from connector 10 in the wiring centre.

Based upon your fine work, thanks - then butchered by me in Visio, so I can attach a copy to the back of the cupboard door wherein all the controls will live.

I could try bluffing it and tell you that in the diagram the stats are calling for heat ;)

I would normally use T&E from the fused spur to the wiring centre. I only use flex for connections to the boiler, pump etc

The diagrams are only a guide. But as you spotted the boiler quite often needs a permanent live as well as the switched live.

I believe you.

Boiler has its own internal pump - the one shown is for the UFH manifold.

ok makes sense ;-)

Makes sense in my head too ... only problem is I've now got to start turning it into actual reality :)