New to Evohome Smart Thermostat - How to replace a Honeywell st9400c with 2 x BDR91 ?

Hi everyone.

I have pretty above average skills with DIY, work in IT and love my gadgets.
I would like to try and fit my new evohome system myself as im struggling to find an installer near me that will actually get back to me with a quote.


I recently bought the following:

- Evohome Smart Wireless Controller THR99C3110 kit
- Evohome Hot Water kit.


My current setup
- Honeywell st9400c thermostat hard wired to boiler in kitchen. This controls my heating and hot water.
- MAIN branded boiler
- Stored hot Water cylinder in airing cupboard
- Old Honeywell Sun dial in living room. This controls my heating on or off as long as the st9400c’s heating function is switch on too. I wouldnt mind removing this altogether or leaving it set to maximum its more trouble to remove.

Can someone please tell me after I remove my old Honeywell st9400c thermostat, which wires go where to the BDR91 devices?
Im struggling to decipher the diagrams Honeywell provide.

I've attached some pictures.

Thanks all!

Attached Images

• IMG_20170916_171154.jpg (83.3 KB)
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• IMG_20170916_171215.jpg (77.4 KB)