Here is a YouTube clip of the unveiling of the Mussabini Blue plaque in Dulwich.
https://www.youtube.com/watch?v=2PXM-ICM8eA
The additional link to Streatham is that Streatham resident and Society member Kevin Kelly, also Herne Hill Harrier archivist, did the research to get the plaque approved by English Heritage and is featured in the clip giving a speech about Mussabini
Ben Cross who was in Chariots of Fire also gives a short speech. Mussabini trained Harold Abrahams (born 15 December 1899), the part played by Ben Cross in Chariots of Fire