terminal – Colour no longer working in vim

I’ve been using vim for as long as I can remember. Never had a problem, until lately. For no reason that I can see, colour has stopped working. First noticed it when editing a Tex file, and I note that indentation is no longer coloured.

color in vim

I can open my .zshrc file, and indeed any other file, and the same. No colour.

It’s vim 8.2.1900 running on a Mac Mini (10.15.7 (19H15)). I do not recall any destructive edits of my .vimrc file.

darren@mac ➜  ~  %{egrep "color|colour" .vimrc
ab cgfred <font color="red"></font>
ab cgfgreen <font color="green"></font>
ab cgfblue <font color="blue"></font>

Any ideas?