Sinclair ZX Spectrum Plus 3
The ZX Spectrum Plus 3 was my own favourite. I bought one in the late 1980s. I remember it came as a promotional pack featuring a light gun and copy of Operation Wolf, which I was awful at.
The Plus 3 had a built in disk drive which had the same three inch disk format as the AMSTRAD machines, including their word processors. This was at a time when 3.5 inch disks were rapidly becoming standard. Nice one Alan!