Help me plan my Christmas Eve grocery shop

Hi, I'm spending Christmas on my own this year and I'm planning out what food to get. I have enough tins, nuts, pasta to feed a small army so it's only really fresh food that I'm looking at.

I am vegan and diabetic. I need to keep sugar content low, even at Christmas as I'm currently under review for whether I need to move to stronger meds (which I'd prefer not to have to do).

What should I get myself for Christmas Eve, Christmas Day and Boxing Day?

My nearest shop is M&S. Iceland, Lidl, Morrisons are also nearby.