'so once they were gone we would be reliant on the council to assist in some way as would have no way of raising it again.'
And then you will be completely at their mercy. Depending on where you live, there may be no stock to suit your family so they'll send you out, however far out it takes, or put you in whatever private let will take council homeless.
You got a pretty unanimous, bar a few, 'Don't do it!' on your other thread, but you posted again, 'for more traffic'.
Quite frankly, you're being quite selfish here. It's all about you and your missing your mum, who chose to move away and has/will have, enough money to purchase her own accommodation.
You have a family now, it's not just about you and what you miss or want anymore and your husband brings up some very, very good points about why this is a bad move.
I quite admire his restraint. I'd have told you in no uncertain terms that you were free to go - without us.