A quick insight into the recording process: This is the first time I've spent a significant amount of time editing the podcast. I used some tips I picked up from Ian Boldsworth, who posted his advice on his Patreon page, and it's come out pretty well. It was only in the final part of the editing that I noticed the slight hissing when I speak to David, and unfortunately it was then too late to edit it out. NB: You may not even be able to hear this unless you have super quality headphones. I can't hear it on my laptop of phone speakers - it's only on my studio headphones that I noticed it.
When closing down the programs that I used to record the podcast, I noticed that on GearBox I had only altered the settings on David's microphone, not on my own - hence the hissing. Lesson learned - the next one will be even better!
All feedback is welcome - please feel free to post your comments below.