1st part - Direct realism.  2nd part (starts at 39mins) - Indirect realism.  3rd part (starts at 1hr07m20sec) - Idealism.  Michael Lacewing, DaN McKee chat with Simon Kirchin.  [Music by Alex Grohl]

PGS - Perceptual Knowledge - short

Philosophy podcast aimed at school students.  Fun, informative, engaging.  Philosophers at universities and schools talk about loads of questions and topics that come up in Philosophy, Ethics and Political Theory - A-Levels / IB / Highers and even GCSE.  Hosted by Simon Kirchin, University of Leeds and Director of the British Philosophical Association.  Timetable of topics: https://stkirchin.wixsite.com/mysite/schools-podcast  (Music by Alex Grohl)