Hi Edwina, quite a few of the early podcasts have a transcription, below the embedded player on the post on our site.

https://gettingthingsdone.com/2015/05/podcast-01-david-allen-talks-about-the-new-edition-of-getting-things-done/

https://gettingthingsdone.com/2015/05/podcast-02-david-allen-talks-to-daniel-pink/

https://gettingthingsdone.com/2015/05/podcast-03-david-allen-guides-you-through-a-mind-sweep/

https://gettingthingsdone.com/2015/06/podcast-04-gtd-and-brute-force/

https://gettingthingsdone.com/2015/06/podcast-05-gtd-and-daily-habits/

https://gettingthingsdone.com/2015/07/podcast-06-gtd-and-creativity/

https://gettingthingsdone.com/2015/12/podcast-10-improving-organization-with-gtd/

https://gettingthingsdone.com/2016/02/gtd-at-the-executive-level/

https://gettingthingsdone.com/2016/03/gtd-and-self-management/

https://gettingthingsdone.com/2016/05/gtd-and-the-medical-community/

https://gettingthingsdone.com/2016/06/ten-common-questions-about-gtd/

https://gettingthingsdone.com/2016/09/episode-21-optimizing-your-gtd-system/

https://gettingthingsdone.com/2016/09/episode-22-gtd-and-balancing-family-life/

https://gettingthingsdone.com/2016/10/episode-23-gtd-and-the-organized-mind/

https://gettingthingsdone.com/2016/11/episode-24-making-it-all-work/

https://gettingthingsdone.com/2016/12/episode-25-making-change-stick/

https://gettingthingsdone.com/2017/01/episode-26-black-belt-gtd/

https://gettingthingsdone.com/2017/02/episode-27-gtd-keys-to-clarifying/

https://gettingthingsdone.com/2017/04/episode-28-gtd-and-mind-mapping/

https://gettingthingsdone.com/2017/05/episode-29-david-allen-gtd-keynote-in-milan-part-one/

https://gettingthingsdone.com/2017/11/episode-35-the-case-for-capturing/