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It gets worse. Unfortunately no one had an informed opinion on the mixer I'd found, so I went back to the brand shown\advertised on the video, ordered a Focusrite, but a Solo model as it was cheaper and seemed to cover the need. Not cheap though.
Then, when I receive it, I get some surprises.
a) I find, to my surprise it doesn't connect to the mains, so I am having to assume it generates the 48v somehow from the USB ?!?
b) according to the box lid (which states an URL address that always fails because something continually adds a further www. to the front when one tries) it seems there is obligatory registration and personal data entry demands, software to download, all sorts of nightmare one is trapped in. Should be illegal. I've bought the kit, it should work out of the box without further contact; not used as a way to abuse the buyer.
c) But that aside, of course I find that I now need an XLR to XLR cable, so I have to order and wait for another cable. sigh. (I did try to push the microphone directly in, but it won't go despite both being XLR.)
Of course the XLR to 3.5mm TRS cable is now defunct. Money wasted. Plus, apparently, I have to find speakers with a phono connection (or buy a phono converter to whatever they have) to hear anything. For now I'm assuming that's an optional extra and the PC will play it anyway. I sure hope so.
"Minefield" was far too soft a word. I take that earlier comment back.