The CELTA library in Room 14 holds several binders with DVDs of lessons taught at IH London.
You can include up to three hours of DVD observation as part of your observation requirement for the course - naturally, you can watch more than just three hours of DVD video!
Scrivener's Learning Teaching has a DVD with lesson extracts to watch. And there is a similar DVD in The Practice of English Language Teaching by Jeremy Harmer (5th edition, Pearson, 2015). Links: CELTA IH blog- click here to go to the blog CELTA IH wiki - click here to go to the wiki