Todd was written out because Bruno Langley had been having sex with an underage girl. He got a suspended sentence but Corrie wrote hm out as soon as he was charged.
By the way, as a long life Corrie fan I watch ITVs Classic Coronation street which shows who episodes every weekday. Starts around 1986 but with so many episodes its caught up. We are saying goodbye to Hilda Hogden this week and Mike Baldwin has just split up with Susan Barlow. The young Peter Barlow was played b a very young David Stockwell from Heartbeat! I saw the very first episode in 1960 and I lived in the same village as one of the characters (graham Habberfield/Jerry Booth and used to babysit for him as well as help out at parties with all the cast, including Ena Sharples and Len Fairclough. Lots of humour, unlike now.