My in-home display is still showing my old EDF rate, not the Go one, as is the electric meter. Now all I look at on the IHD is the kwH, I've given up on the cost. I've downloaded the octopus watch app from the app store on my phone and from that, you can see exactly what you're using and being charged on a daily basis.
It doesn't work with IO so now that's kicked in for me I'm not sure what it will show, I guess I'll find out in the next couple of days. I'm hoping it still shows all the data but just can't calculate anything where I get the off-peak rate outside of the off-peak hours.