Wireless World Digital Computer

The forward :- (complete with spelling mistake)

"Low-cost desk-top binary machine for small-scale calculations and for use in schools as a teaching aid, designed by B. Crank of "Wirless World" staff. Numbers are fed in manually and results of calculations are read from indicator lamps. Instructions, entered in binary coded form by a set of switches, are interpreted and carried out automatically by the machine"

It was an 8 bit serial machine. It had three speeds 1 bit at a time initiated by a switch, slow 2 bits per sec and fast 2500 bits per second.