On 31st March 2016, technical changes will take place on satellite allowing ITV to launch HD variants of ITV Anglia (East), ITV Yorkshire (West) and ITV Tyne Tees. The HD services will replace the existing out-of-region HD version on the current ITV HD channel number slot.
I did checked to see if ITV Tyne Tees HD had replaced ITV Granada HD today but it aint (Tyne Custom)Code:-http://www.a516digital.com/2016/03/itv-to-launch-three-new-hd-regions-on.html
so I'm guessing changes are needed to be made to ABM to allow these to replace ITV Granada HD slot etc etc,