Library file dated 27.02.67 London University girls with yo-yo's in Trafalgar Square. The yo-yo is back in favour - and children are queuing up to get them, it emerged today (Tuesday). Companies have reported a huge increase in sales - driven by new high-tech yo-yos. Mr John Howard of PMS International manufactures yo-yos, said that last year the company sold only a few hundred of the toys - but he expected that by the end of next month, sales so far this year would top half-a-million. See PA Story SOCIAL Yo-Yo. AVAILABLE IN B/W ONLY.