Creator of the world's first pocket calculator, producer of electric cars when Elon Musk was still in school and single-handedly responsible for the UK's (if not European) computer game industry, leading to GTA and beyond. A very great man indeed.
The nerd in me has to point out that the ZX80 was named after the Z80 chip and not the year 1980, as the Guardian obituary says.
ZX80:
https://nocanvas.zame-dev.org/0004/
ZX81:
https://www.zx81stuff.org.uk/zx81/jtyone.html
ZX82:
https://torinak.com/qaop/games