My dad 'pilfered' a ZX80 from Napier College at some point in the early 80's.
(He was a lecturer there - he also borrowed Pet Commodores and proper lasers in the 1970s that I remember playing with at home)
We still have it. Ahh... the memories of actually running out of RAM memory (It had 1kb) and not being able to complete programs!
(when I got the 48kb ZX Spectrum it was like the age of Aquarius had re-dawned)
Having said that it was pretty incredible what one could do with 1kb - there was a chess program with AI that, I believe, used ~800 bytes