Well I went for new hardware option... Intel i7 12700k, Asus Z690 Plus D4 WiFi, Corsair Vengeance LPX Black 32GB (2x16GB) DDR4 3200MHz Dual Channel Memory (RAM) Kit, Be Quiet Shadow Rock 3, ordered free LGA1700 mounting kit form Be Quiet Germany (arrived in 2 days!)
Took M.2 drive from old system, had Windows 10 pro already on it, booted up on new motherboard, re run Windows 11 readiness tool, installed Windows 11 pro/activated.
So GNA drivers on Intel's site and Asus were unsigned... good start! found previous version which worked ok, Asus confirmed that drivers needed signing!
If you use Adobe/OBS or other program that uses onboard graphics and add in card, I have a GTX1080, you need Quick sync... oh dear another problem... installed drivers, but Intel graphics command centre won't recognise UHD Graphics 770, so no hardware acceleration on Adobe premier.
Intel haven't got back to me yet on this.