It's tough but I think DH is right, it's time to get off the fence and make proactive changes for the good of everyone. You, and Mum, have to grasp the nettle that her current flimsy "support" arrangement is too precarious and too hard on everyone. It has to change.
So look at some options.
Downsizing + a move south is s lightly complicated procedure ( for instance, selling in Scotland/ buying in England will require two estate agents AND two lawyers and the trouble of trying to integrate chains in two countries).
So, I wonder if you have considered selling Scotland and moving to rental here, ahead of the next stage, househunting a new home in England.
* Organising , decluttering and sale will distract DH from resenting your Mum
* It simplifies your move.
* Mum has time ( and your help) to find a safer lifestyle.
She might surprise you and announce "If I'm going into residential care I'd prefer to be near you in England/ or near our other family.
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