I'm trying to find online material (essays, sermons, articles, etc.) to read by previous Chief Rabbis of the United Kingdom before Rabbi Jonathan Sacks. I am particularly interested in Joseph Hertz, Israel Brodie and Immanuel Jakobovits. Any help would be greatly appreciated.
Since you say "any help", here is a small offering:
Part of “Immanuel Jakobovits: A Coherent Theology of Apparent Contradiction” is available here – more if you have an Oxford Academic account .
From Joseph Hertz there is a great selection of papers and sermons here.