Thanks Tris for liking the pictures, yes the garden looks wonderful and the abundant growth is both a both a joy ad a relief, as everything is so new.
That lady’s comment makes no sense at all! How would incorporating it reduce a supposed tendency to burn roots?!
I have never come across any compost which burns roots, apart from fresh poultry manure. Its a myth spread by ICI!
So your original idea is good and I wish you big brassicas.