Socialist Studies have started a youtube channel and uploaded videos of Edgar Hardcastle when he was a member of the SPGB. https://www.youtube.com/channel/UCXq...6xvrr34yezA_Tw
Lecture 5 from 1986 has been uploaded https://www.youtube.com/watch?v=ip3EFALINjw
The list of this series of talks is detailed at the beginning of some of the videos and also page 19 of Socialist Standard July 1986 here https://www.scribd.com/doc/97135506/...d-1986-982-Jul
Lectures 4 and 5 have been transcribed in full and are or will be made available at http://libcom.org/library/marxian-economics-1986