TVHeadend EPG data not showing in Kodi

I've got EPG data in my TVHeadend client as you can see below, but...

I can't get that information to appear in the 'guide' on Kodi. It's driving me nuts and no matter what I google I can't seem to find a guide. I suspect I have to link the channels somehow, but I can't see where. Any thoughts?

I'd be forever in your debt if you can help me with this one before I lose my sanity!

Helps if you don't have the 'Prevent updates during playback' radio button checked in the settings > pvr & live TV > Guide.!!!

Can't believe that has taken me half a day to find!