Hi,
Michael Billington's biography of Pinter is worth checking, for example the section Playwright in Waiting dealing with Hothouse
The British Museum have theses which you can download for free. For example:
- "The city and landscapes beyond Harold Pinter''s rooms" by Dilek Inan covers different territory (away from the caged landscape) but may still have insights
- "Harold Pinter and the performance of power: Considerations of affect in select plays, screenplays and films, poetry and political speeches" by Basil Chiasson
There are various others on Pinter and on Bond.
The site is here
http://ethos.bl.ukI just finished Antonia Fraser's diary of her life with Pinter, useful but not for your topic.
I hope this helps.
Iain