[TVFan]

On another note, I'm surprised ITV have never tried weekend editions of GMB before - they seem to have tried everything else on weekend mornings, so why not GMB?

Probably because the current slew of hour long formats, which I think began with Aled Jones as a “Daybreak contract ender”, but has since seen Sara Cox, Zoe Ball, Martin and Roman Kemp, Vick Hope, Katie Piper and Kate Garraway are all pre recorded and done fairly on the cheap. 

GMB would have to be live, plus a lot more resource with reporters etc. It worked for the Queen editions because they utilised ITV News reporters who were already scattered around. 

I guess a Saturday edition would work in the normal slot, but if they ever did it on a Sunday - I’d say 8am onwards?

There’s also the fact they still have to show CITV programmes to fill the children’s quota, so they wouldn’t be able to start until around 8, unless they moved the kids’ shows earlier to around 5am (like they used to do at Christmas in the 00s).