If you are looking for a specific author search might be your best bet. Some really great lecture series are pulled out below:
General
The Mysteries of Reading and Writing Belinda Jack
The Mysteries of Writing Poems and Novels Belinda Jack
The Mysteries of Writing Poems and Plays Belinda Jack
The Theatre in London (series - audio and transcript only as old)
Dickens
Dickens: The Last Decade Michael Slater
Dickens' Public Readings: A Tale of Two Desks Malcolm Andrews
George Eliot
George Eliot and Relationships Rosemary Ashton
The Romantics
Wordsworth and The Romantics series Jonathan Bate
Shakespeare
Classic Shakespeare series Jonathan Bate
Literary Londoners
Series (transcripts only) includes Blake, Jonson, Dickens, Donne, Keats
West Indian Writing in Britain (from 1998, transcript only) E A Markham
Issues and Themes
Cultural Misfits: Gender in Early 20th Century Literature Georgia Johnstone
Speechwriting and Speechmaking
Gresham's historic 'Rhetoric' professorship means we carry quite a bit of material on the art of speechwriting/ making. A couple of really brilliant lectures below:
Public Speaking Without Fear Alex Edmans
The Art of Rhetoric Simon Lancaster
Speechwriting: Creating Authenticity Simon Lancaster