Yes, thanks. I've been reading about it all since posting...
My d-i-y machine mobo and processor is mostly long in the tooth and the BIOS is well old, though the machine performs pretty well for most stuff I use and benchmarks well in the top 1/3 of all home machines (or something like that!). It has an Intel i5-4690 which isn't in the supported list and the memory is DDR3 which also doesn't bode well.
Nevertheless I have loosened the purse strings and just ordered some new lowish end stuff, which is compatible and will be coming in a week or so. It's a Gigabyte mobo, and I did notice then that they do the TPM stuff in the bios rather than requiring it on the board.
I ordered a new mobo & i5 processor (from the list!), a M.2 SSD and 16Gb memory for about £210. At least that way I can get the free WIN11 upgrade while it's still available.
So initially I'll try it with the current C drive but recognising that I may have to reinstall everything is a possiblity to fix the problem above.
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