After talking about it for a year, I finally got a new one to replace my 2010 iMac. There is nothing wrong at all with the 2010 machine, had a load of upgrades done and works flawlessly, but good old Apple choose to not support it, so sooner or later it’s gonna become obsolete not through hardware being dated or failing, but by software refusing to work on it. Good old environmentally conscious Apple.
Anyway, for anyone else stuck with an older machine that they know they will have to upgrade soon, but refuse to be shafted by Apple with their utterly dated more or less unrepairable nonupgradable overpriced present iMac offering, John Lewis have the 2017 models reduced (based model down to £1200) with a two year warranty.
Hardly a perfect solution, as it’s still impossible to get into with invalidating the warranty so you’re stuck with an HDD from the 1990s, but at least now, when Apple f**k you, they’re only putting the tip in.
I’ll live with the Fusion drive for as long as I can, then look at hooking up a USB-C external till the warranty is up, then pull it apart and do the job right.