Thank you

and RIP, Sir Clive. The cunning little machine on the right  was not years but decades ahead of its time. Ready to code in BASIC, Beginners' All-purpose Symbolic Instruction Code. I was still a schoolboy in 1970 when Hatfield Poly (now Uni) aquired a BASIC interpreter for their Elliot 903 mainframe - a great leap forward from ALGOL. The Sinclair machines, only a decade later,  used the Zilog Z80 chip as the microprocessor, and coding assembler programs was possible and sometimes essential given the 1Kbyte RAM on the ZX81. (Contd JP 94h)