I just figured out (or rather, fortuitously stumbled upon) how to get the recordings and photos off my old iPhone. Just in time too as I was one click away from Restoring it to Factory Settings.
Top Tip: press Command and Alt when plugging in your phone to allow it to be a drive.
Any way, this means I now have a treasure trove of hitherto ignored recordings and photos, which are now all the more precious for having been snatched from the jaws of oblivion.
I shall upload some of things I am most glad not have lost in an ad hoc manner from now on it.