You have many good replies Your grandchildren are more or less grown ups and now you are the one in need of care from them.Your granddaughter may also be concerned for your welfare, living alone, so it may be a relief to her if you move to your daughter's and son in law's place. You could be doing all your loved ones a favour if you move to Lincolnshire. It's a super offer from your daughter and son in law!
Your mental and physical health is a prime concern. Will your younger daughter and her husband care for you now and if your health worsens?
There will come a moment during this problem when something quite small happens and you will know what you want to do. I had a similar problem, and I did make the move from Scotland to England. I was glad I did so.
My friends in Edinburgh were dead or gone away so the move was mainly about changing places. The converted barn in Lincolnshire sounds great for you and dogs, although I presume it has all facilities on the ground floor?
Harry and Meghan ‘royal’ tour of Nigeria.
The Republic of Ireland and their tensions with migrants.