BBC Basic II does have ELSE, it just has to go on one line.

IF A=4 THEN PRINT "FOUR" ELSE PRINT "NOT FOUR"

Statements for the IF block and the ELSE block can be separated by ':'.

I was recently given a BBC Micro and it's a fascinatingly impressive machine, the hardware and software are so beautifully designed in tandem that it's quite awesome even in 2020.