Huge apologies to all who experienced audio issues with the original upload of this video. From the feedback received it seems to be an issue that only affects Bluetooth headphones, which move all of the voiceovers to the left channel only.
After some online research as to the cause, I've reuploaded this version which I hope has addressed the issue. Please let me know in the comments if this fix works, otherwise I'll go back to the drawing board!
Sincere apologies again!