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as an update i just wanted to say thank you to all for their input. It really did help and i finally got it working........ yippee in the end it was as we discussed. the brown was live, grey was neutral and black was the switched live in the tstat and the black wire in the tstat did go back...

So by process of elimination......and to clarify Block 11 as per piccie, in the wiring centre we think is neutral so this can go to the N terminal in the bdr91. Block 10 as per piccie, we think is the permernant live so this can go to the L terminal in the bdr91. Block 9 as per piccie, we...

Follow up..... As per my opening post - mid position valve goes stright into the wiring centre.

Thanks. Seems like I have opened up a can of worms! Not sure if it makes a difference but the house was new 6years ago so not sure if there are any set formats for wiring that need to be followed for regs at this point that wouldnhelp what wires are which in the wiring centre? If it...

Hi, thanks. That's the problem though. I do not know which wires from the wiring centre go to the thermostat or whether the thermostat wires go straight to the boiler. I was going to temporarily remove the old thermostat so it didn't interfere with anything and eventually use these...

Thanks for your response. I should have mentioned that i have a 3 wire honeywell room tstat in the hall and there is also a Drayton lp241 2 channel programmer in the kitchen downstairs which i know i will have to leave this set the CH on constant for this to work (I do want to get rid of this...

Hi all I thought I had this sussed but then got myslef confused when trying to wire in the relay next to the wiring centre. This is what it currently look likes: (Sorry the pic is upside down) The wires that you can see coming in at the top left of the picture. From left...