State middle school in the West Midlands, England
Wrote first computer program in BASIC on a white plastic Sinclair Z80.
The code went something like:
10 PRINT "HELLO WORLD"; 20 GOTO 10 RUN
The addition of the semicolon at the end of line 10 enabled the words "Hello world" to be displayed horizontally as well as vertically across the monitor screen. Its omission would just leave the text printed vertically.