You can hear Camiel’s podcast every week in Lex Bohlmeijer’s programme Passaggio. The last two were about Bruckner and Wagner:
Podcast Wagner Radio4: https://www.nporadio4.nl/fragmenten/audio/385584-brief-aan-wagner-van-camiel-boomsma
Podcast Bruckner Radio4:
https://www.nporadio4.nl/fragmenten/audio/384338-brief-aan-bruckner-van-camiel-boomsma?programme=2445