Struggling with CH control

Hi All

Hoping someone can give me suggestions as I'm struggling to figure this out! I have emailed tado but no reply as yet...

I have a Worcester Bosch greenstar Ri, I've installed the wireless thermostat with hot water control.

I've followed the instructions in the app and think I have wired it up correctly. I've tried multiple time to re-pair the sensor/ bridge.

The hot water is working fine, setup on a schedule and comes on and off as programmed and manual control works fine via the app and the wireless temperature sensor controller.

The issue I have is with the central heating. It does not come on when scheduled or manually controlled (either via the app or wireless temp sensor). The app tells me the temp and tells me that it's on/off even though it's not, if the app shows the room is now up to temperature the boiler will stay on. It's like the receiver does receive the commands for the CH from the app or wireless temp sensor, it does not attempt to come on as I can't see the light or hear a relay switch come on.

However, if I press the CH test button on the programmer it will do it's test then stay on to what ever is programmed be that on or off. So I do have control to turn the heating on or off, so it appears to be working. But I just have no control of it remotely or on a schedule.

My wiring:

The old temperature sensor has been bridged.

Old & new wiring - (note, the black and red electrical wiring has been replaced with newer standard blue/brown)

Can anyone see anything glaringly obvious that I've wired up incorrectly? Or does any other suggestions? Could it be a port forwarding issue?

Thanks in advance!

Adam