Whilst trying to coerce Google / Blogger / Disqus to cooperate and get the comments for this blog indexed, I discovered how to enable comments on the mobile view of the site. Cool.
Foolishly I was looking at how to tweak the mobile template (and googling based on that), but it was just a matter of adding a parameter to the Disqus code on the main template that did it. How that works, I don't know. However it's also one of those things I don't care about either, so I am happy in my ignorance.
Anyway, sorry for any irritation caused in not being able to comment from your mobile device. Now you can.