@ZXVintage I ordered one of those #EastLondonRobotics upgrade kits, though I most likely saw the ad in #Crash rather than Sinclair User.

The chips arrived secured in a plastic tube and some polystyrene, with some rudimentary instructions on how to install them.

My brother helped me with the "open #Speccy surgery", using his bed as a workbench, and we soon had the chips installed.

That was my first hardware upgrade, but definitely not the last.