Changing wireless recievers wiring advice

[NHW]

I currently have a boiler (Worcester Greenstar 30i combi) which already has a wireless receiver connected to it (British Gas WR1).

I am changing over to the tado system and just wanted to check I am wiring up the reciever correctly.

I have just opened the faceplate of the existing reciever (mains elec switched off) and as expected there is Live, Neutral and then the other cables connected are:

1 C (connected)
2 Sat (empty)
3 Call (connected)

The live and neutral is straight forward but just wanted to check the final 2 cables.

I'm assuming that 1 C goes into CH COM on the tado, but the 3 Call cable, does that go into CH NC or CH NO?

Pictures included for reference. Thanks

 

[RandomGrinch]

but the 3 Call cable, does that go into... CH NO

 

[NHW]

Thank you Grinch, much appreciated