Its surprising that people often think of mortgages from just one angle. I am happy if mortgage rates go up to more normal levels, because it means that my savings income goes up as well. There are after all more households without mortgages than with mortgages. Not only that but mortgagees have had it good for 15 years and even now we arent back to normal interest rate levels.
The B of E has only one trick - interest rates. But worry if they donw get inflation under control - the highest previous bank rate was 17% in 1980.

I believe the veg shortages (all gone now I understand) were down to withdrawal of british supplies since we didnt subsidise their energy use, and a bad winter in Spain and N Africa. Nothing to do with Brexit